Harden npm install defaults (#1026)

CI already disables npm lifecycle scripts, but ordinary installs from
the repository still run them. Set `ignore-scripts = true` in `.npmrc`
so developer and maintenance installs use the same default. Keep the
existing seven-day `min-release-age` policy for new resolutions. Require
`npm>=11.10.0` through `engines.npm` and `engine-strict`, while
retaining `devEngines` for newer clients; older installers can otherwise
ignore `devEngines` and the age setting. Pin the build and checksum
workflows to Node.js `24.19.0` so their bundled `npm` supports the
policy. Explicit project commands such as `npm run package` remain
available.

Related: astral-sh/ruff-action#401 applies the matching `npm` defaults,
and astral-sh/ruff-action#411 adds the same legacy-aware version floor.
astral-sh/ruff#27837 applies the install-script default to Ruff's
JavaScript projects. astral-sh/setup-uv#1027 separately adds
registry-signature and provenance verification.

---------

Co-authored-by: zaniebot <242828183+zaniebot@users.noreply.github.com>

.agents/skills/dependabot-pr-rollup/SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: dependabot-pr-rollup
-description: Find open Dependabot PRs for the current GitHub repo, compare each PR head to its base branch, replay only the net dependency changes in a fresh worktree and branch, run npm validation, and optionally commit, push, and open a PR. Use when you want to batch or manually replicate active Dependabot updates.
+description: Find open Dependabot PRs for the current GitHub repo, compare each PR head to its base branch, replay only the net dependency changes in a fresh worktree and branch, run npm validation, then commit, push, and open a pull request labeled dependencies. Use when you want to batch or manually replicate active Dependabot updates.
 license: MIT
 compatibility: Requires git, git worktree, gh CLI auth, npm, and a GitHub repo with an origin remote.
 ---
@@ -13,7 +13,7 @@ Use this skill when the user wants to:
 - find all open Dependabot PRs in the current repo
 - reproduce their net effect in one local branch
 - validate the result with the repo's standard npm checks
-- optionally commit, push, and open a PR
+- commit and push the validated changes, then open a PR labeled `dependencies`
 
 ## Workflow
 
@@ -28,7 +28,8 @@ Use this skill when the user wants to:
    - Use `npm install ... --ignore-scripts` for direct dependency changes so `package-lock.json` stays in sync.
    - When updating `@biomejs/biome`, also update the Biome schema URL version in `biome.json` to match the installed Biome version.
 7. Run `npm run all`.
-8. If requested, commit the changed source, lockfile, and generated artifacts, then push and open a PR.
+8. Commit the changed source, lockfile, and generated artifacts, then push the branch.
+9. Always open a pull request for the rollup and add the `dependencies` label to it. Pass `--label dependencies` to `gh pr create`, or add the label immediately afterward with `gh pr edit --add-label dependencies`.
 
 ## Repo-specific notes
 
@@ -46,4 +47,5 @@ Always report:
 - new worktree path
 - files changed
 - `npm run all` result
-- if applicable, commit SHA and PR URL
+- commit SHA and PR URL
+- confirmation that the PR has the `dependencies` label

.gitattributes

@@ -1,2 +1,3 @@
 * text=auto eol=lf
 dist/** -diff linguist-generated=true
+src/download/checksum/known-checksums.json linguist-generated=true

.github/actionlint.yaml

@@ -8,6 +8,10 @@ self-hosted-runner:
 # Empty array means no configuration variable is allowed.
 config-variables: null
 paths:
+  .github/workflows/**/*.{yml,yaml}:
+    ignore:
+      - 'specifying action "\$/" in invalid format because ref is missing'
+      - 'reusable workflow call "\$/.+" at "uses" is not following the format'
   .github/workflows/test.yml:
     ignore:
       - 'invalid runner name.+'

.github/dependabot.yml

@@ -5,11 +5,11 @@ updates:
     schedule:
       interval: daily
     cooldown:
-      default-days: 7
+      default-days: 30
 
   - package-ecosystem: npm
     directory: /
     schedule:
       interval: daily
     cooldown:
-      default-days: 7
+      default-days: 30

.github/workflows/codeql-analysis.yml

@@ -41,13 +41,13 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@99df26d4f13ea111d4ec1a7dddef6063f76b97e9 # v4.37.0
+        uses: github/codeql-action/init@5595ccaf912efad79be6eef63a5619ff05969be3 # v4.37.6
         with:
           languages: ${{ matrix.language }}
           source-root: src
@@ -59,7 +59,7 @@ jobs:
       # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
       # If this step fails, then you should remove it and run the build manually (see below)
       - name: Autobuild
-        uses: github/codeql-action/autobuild@99df26d4f13ea111d4ec1a7dddef6063f76b97e9 # v4.37.0
+        uses: github/codeql-action/autobuild@5595ccaf912efad79be6eef63a5619ff05969be3 # v4.37.6
 
       # ℹ️ Command-line programs to run using the OS shell.
       # 📚 https://git.io/JvXDl
@@ -73,4 +73,4 @@ jobs:
       #   make release
 
       - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@99df26d4f13ea111d4ec1a7dddef6063f76b97e9 # v4.37.0
+        uses: github/codeql-action/analyze@5595ccaf912efad79be6eef63a5619ff05969be3 # v4.37.6

.github/workflows/release-drafter.yml

@@ -19,7 +19,7 @@ jobs:
       pull-requests: read
     steps:
       - name: 🚀 Run Release Drafter
-        uses: release-drafter/release-drafter@4d75298e00d9e34c483e5ff8c68d0ea1c1940c1e # v7.5.1
+        uses: release-drafter/release-drafter@34d80673e067bdc0c24568d3af899c216adcfaa9 # v7.7.0
         with:
           commitish: ${{ github.sha }}
         env:

.github/workflows/release.yml

@@ -116,7 +116,7 @@ jobs:
     name: Update docs
     needs:
       - release
-    uses: ./.github/workflows/update-docs.yml
+    uses: $/.github/workflows/update-docs.yml
     permissions:
       contents: write
       pull-requests: write

.github/workflows/test.yml

@@ -21,13 +21,13 @@ jobs:
     permissions:
       security-events: write # for zizmor
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Actionlint
         uses: eifinger/actionlint-action@1fc89649be682d16ec5cf65ea16e269eb88d3982 # v1.10.2
       - name: Run zizmor
-        uses: zizmorcore/zizmor-action@192e21d79ab29983730a13d1382995c2307fbcaa # v0.5.7
+        uses: zizmorcore/zizmor-action@3dc1ecc9bcb9e94e9b2c709687979e1298497054 # v0.6.2
       - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
           node-version-file: .nvmrc
@@ -51,12 +51,12 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, macos-14, windows-latest]
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Install latest version
         id: setup-uv
-        uses: ./
+        uses: $/
       - run: uv sync
         working-directory: __tests__/fixtures/uv-project
         shell: bash
@@ -76,12 +76,12 @@ jobs:
   test-uv-no-modify-path:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Install with UV_NO_MODIFY_PATH set
         id: setup-uv
-        uses: ./
+        uses: $/
         env:
           UV_NO_MODIFY_PATH: 1
       - run: |
@@ -125,12 +125,12 @@ jobs:
             expected-version: "0.1.0"
             resolution-strategy: "lowest"
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Install version ${{ matrix.input.version-input }} with strategy ${{ matrix.input.resolution-strategy || 'highest' }}
         id: setup-uv
-        uses: ./
+        uses: $/
         with:
           version: ${{ matrix.input.version-input }}
           resolution-strategy: ${{ matrix.input.resolution-strategy || 'highest' }}
@@ -154,11 +154,8 @@ jobs:
       matrix:
         version-input: ["latest", ">=0.8"]
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
       - name: Install version ${{ matrix.version-input }}
-        uses: ./
+        uses: $/
         with:
           version: ${{ matrix.version-input }}
       - name: Latest version gets installed
@@ -194,11 +191,11 @@ jobs:
           - working-directory: "__tests__/fixtures/uv-toml-project"
             expected-version: "0.5.15"
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Install version from ${{ matrix.input.working-directory }}
-        uses: ./
+        uses: $/
         with:
           working-directory: ${{ matrix.input.working-directory }}
       - name: Correct version gets installed
@@ -220,11 +217,11 @@ jobs:
           - version-file: "__tests__/fixtures/.tool-versions"
             expected-version: "0.5.15"
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Install version from ${{ matrix.input.version-file }}
-        uses: ./
+        uses: $/
         with:
           version-file: ${{ matrix.input.version-file }}
       - name: Correct version gets installed
@@ -234,15 +231,40 @@ jobs:
             exit 1
           fi
 
+  test-tool-versions-python-version:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+      - name: Install versions from .tool-versions
+        id: setup-uv
+        uses: $/
+        with:
+          version-file: "__tests__/fixtures/.tool-versions"
+      - name: Verify Python version from .tool-versions
+        run: |
+          if [ "$UV_PYTHON" != "3.13.1t" ]; then
+            echo "Wrong UV_PYTHON: $UV_PYTHON"
+            exit 1
+          fi
+          if [ "$PYTHON_VERSION" != "3.13.1t" ]; then
+            echo "Wrong python-version output: $PYTHON_VERSION"
+            exit 1
+          fi
+        shell: bash
+        env:
+          PYTHON_VERSION: ${{ steps.setup-uv.outputs.python-version }}
+
   test-malformed-pyproject-file-fallback:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Install using malformed pyproject.toml
         id: setup-uv
-        uses: ./
+        uses: $/
         with:
           working-directory: "__tests__/fixtures/malformed-pyproject-toml-project"
       - run: uv --help
@@ -257,11 +279,11 @@ jobs:
           - os: macos-latest
             checksum: "a70cbfbf3bb5c08b2f84963b4f12c94e08fbb2468ba418a3bfe1066fbe9e7218"
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Checksum matches expected
-        uses: ./
+        uses: $/
         with:
           version: "0.3.2"
           checksum: ${{ matrix.inputs.checksum }}
@@ -271,11 +293,11 @@ jobs:
   test-with-explicit-token:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Install default version
-        uses: ./
+        uses: $/
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
       - run: uv sync
@@ -284,12 +306,9 @@ jobs:
   test-uvx:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
       - name: Install default version
-        uses: ./
+        uses: $/
-      - run: uvx ruff --version
+      - run: uvx ruff@0.14.10 --version
 
   test-tool-install:
     runs-on: ${{ matrix.os }}
@@ -297,12 +316,9 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, macos-14, windows-latest]
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
       - name: Install default version
-        uses: ./
+        uses: $/
-      - run: uv tool install ruff
+      - run: uv tool install ruff==0.14.10
       - run: ruff --version
 
   test-python-version:
@@ -311,12 +327,12 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Install latest version
         id: setup-uv
-        uses: ./
+        uses: $/
         with:
           python-version: 3.13.1t
       - name: Verify UV_PYTHON is set to correct version
@@ -343,12 +359,9 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
       - name: Install latest version
         id: setup-uv
-        uses: ./
+        uses: $/
         with:
           python-version: 3.13.1t
           activate-environment: true
@@ -382,12 +395,9 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
       - name: Install latest version
         id: setup-uv
-        uses: ./
+        uses: $/
         with:
           python-version: 3.13.1t
           activate-environment: true
@@ -433,9 +443,6 @@ jobs:
   test-activate-environment-no-project:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
       - name: Create incompatible pyproject.toml
         run: |
           cat > pyproject.toml <<'EOF'
@@ -451,7 +458,7 @@ jobs:
         shell: bash
       - name: Install latest version with no-project
         id: setup-uv
-        uses: ./
+        uses: $/
         with:
           python-version: 3.13.1t
           activate-environment: true
@@ -477,11 +484,11 @@ jobs:
     runs-on: ubuntu-latest
     container: debian:unstable
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Install latest version
-        uses: ./
+        uses: $/
         with:
           enable-cache: true
       - run: uv sync
@@ -489,14 +496,14 @@ jobs:
 
   test-musl:
     runs-on: ubuntu-latest
-    container: alpine
+    container: alpine@sha256:28bd5fe8b56d1bd048e5babf5b10710ebe0bae67db86916198a6eec434943f8b # 3.24.1
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Install latest version
         id: setup-uv
-        uses: ./
+        uses: $/
         with:
           enable-cache: true
       - name: Verify cache key contains alpine
@@ -530,12 +537,9 @@ jobs:
           - os: windows-2025
             expected-os: "windows-2025"
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
       - name: Setup uv
         id: setup-uv
-        uses: ./
+        uses: $/
         with:
           enable-cache: true
       - name: Verify cache key contains OS version
@@ -556,11 +560,11 @@ jobs:
         enable-cache: ["true", "false", "auto"]
         os: ["ubuntu-latest", "windows-latest"]
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Setup with cache
-        uses: ./
+        uses: $/
         with:
           enable-cache: ${{ matrix.enable-cache }}
           cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-setup-cache-${{ matrix.os }}-${{ matrix.enable-cache }}
@@ -575,12 +579,12 @@ jobs:
         os: ["ubuntu-latest", "windows-latest"]
     needs: test-setup-cache
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Restore with cache
         id: restore
-        uses: ./
+        uses: $/
         with:
           enable-cache: ${{ matrix.enable-cache }}
           cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-setup-cache-${{ matrix.os }}-${{ matrix.enable-cache }}
@@ -609,11 +613,11 @@ jobs:
   test-setup-cache-requirements-txt:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Setup with cache
-        uses: ./
+        uses: $/
         with:
           enable-cache: true
           cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-setup-cache-requirements-txt
@@ -625,12 +629,12 @@ jobs:
     runs-on: ubuntu-latest
     needs: test-setup-cache-requirements-txt
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Restore with cache
         id: restore
-        uses: ./
+        uses: $/
         with:
           enable-cache: true
           cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-setup-cache-requirements-txt
@@ -649,11 +653,11 @@ jobs:
   test-setup-cache-dependency-glob:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Setup with cache
-        uses: ./
+        uses: $/
         with:
           enable-cache: true
           cache-dependency-glob: |
@@ -666,7 +670,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: test-setup-cache-dependency-glob
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Change pyproject.toml
@@ -675,7 +679,7 @@ jobs:
           echo 'dev-dependencies = []' >> __tests__/fixtures/uv-project/pyproject.toml
       - name: Restore with cache
         id: restore
-        uses: ./
+        uses: $/
         with:
           enable-cache: true
           cache-dependency-glob: |
@@ -694,11 +698,11 @@ jobs:
   test-setup-cache-save-cache-false:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Setup with cache
-        uses: ./
+        uses: $/
         with:
           enable-cache: true
           save-cache: false
@@ -710,12 +714,12 @@ jobs:
     runs-on: ubuntu-latest
     needs: test-setup-cache-save-cache-false
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Restore with cache
         id: restore
-        uses: ./
+        uses: $/
         with:
           enable-cache: true
           cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-setup-cache-save-cache-false
@@ -730,11 +734,11 @@ jobs:
   test-setup-cache-restore-cache-false:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Setup with cache
-        uses: ./
+        uses: $/
         with:
           enable-cache: true
           cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-setup-cache-restore-cache-false
@@ -745,12 +749,12 @@ jobs:
     runs-on: ubuntu-latest
     needs: test-setup-cache-restore-cache-false
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Restore with cache
         id: restore
-        uses: ./
+        uses: $/
         with:
           enable-cache: true
           restore-cache: false
@@ -773,11 +777,8 @@ jobs:
             expected-cache-dir: "D:\\a\\_temp\\setup-uv-cache"
     runs-on: ${{ matrix.inputs.os }}
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
       - name: Setup with cache
-        uses: ./
+        uses: $/
         with:
           enable-cache: true
           cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-cache-local
@@ -791,11 +792,8 @@ jobs:
   test-cache-local-cache-disabled:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
       - name: Setup without cache
-        uses: ./
+        uses: $/
         with:
           enable-cache: false
 
@@ -810,11 +808,8 @@ jobs:
   test-cache-local-cache-disabled-but-explicit-path:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
       - name: Setup without cache
-        uses: ./
+        uses: $/
         with:
           enable-cache: false
           cache-local-path: /tmp/uv-cache-disabled
@@ -830,13 +825,13 @@ jobs:
   test-no-python-version:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Fake pyproject.toml at root
         run: cp __tests__/fixtures/old-python-constraint-project/pyproject.toml pyproject.toml
       - name: Setup with cache
-        uses: ./
+        uses: $/
         with:
           enable-cache: true
       - run: uv sync
@@ -845,11 +840,11 @@ jobs:
   test-custom-manifest-file:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Install from custom manifest file
-        uses: ./
+        uses: $/
         with:
           manifest-file: "https://raw.githubusercontent.com/astral-sh/setup-uv/${{ github.ref }}/__tests__/download/custom-manifest.ndjson"
       - run: uv sync
@@ -864,12 +859,9 @@ jobs:
   test-download-from-astral-mirror-false:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
       - name: Install with download-from-astral-mirror disabled
         id: setup-uv
-        uses: ./
+        uses: $/
         with:
           download-from-astral-mirror: false
       - name: Verify uv is installed
@@ -878,14 +870,11 @@ jobs:
   test-absolute-path:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
       - name: Create requirements.txt
         run: echo "uv==0.6.17" > /tmp/setup-uv-requirements.txt
       - name: Install from requirements file
         id: setup-uv
-        uses: ./
+        uses: $/
         with:
           version-file: "/tmp/setup-uv-requirements.txt"
       - name: Correct version gets installed
@@ -898,16 +887,13 @@ jobs:
   test-relative-path:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
       - name: mkdir
         run: mkdir -p /tmp/setup-uv-test-relative-path
       - name: Create requirements.txt
         run: echo "uv==0.6.17" > /tmp/setup-uv-test-relative-path/setup-uv-requirements.txt
       - name: Install from requirements file
         id: setup-uv
-        uses: ./
+        uses: $/
         with:
           version-file: "./setup-uv-requirements.txt"
           working-directory: "/tmp/setup-uv-test-relative-path"
@@ -922,11 +908,11 @@ jobs:
   test-cache-prune-force:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Setup uv
-        uses: ./
+        uses: $/
         with:
           cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-cache-prune-force
       - name: Create long running python script
@@ -939,7 +925,7 @@ jobs:
   test-cache-dir-from-file:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Verify uv cache dir is not populated
@@ -949,7 +935,7 @@ jobs:
             exit 1
           fi
       - name: Setup uv
-        uses: ./
+        uses: $/
         with:
           working-directory: __tests__/fixtures/cache-dir-defined-project
       - run: uv sync
@@ -966,11 +952,11 @@ jobs:
     env:
       UV_PYTHON_INSTALL_DIR: /tmp/missing-uv-python
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Setup uv with cache and python cache enabled
-        uses: ./
+        uses: $/
         with:
           enable-cache: true
           cache-python: true
@@ -987,7 +973,7 @@ jobs:
   test-cache-python-installs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Verify Python install dir is not populated
@@ -997,7 +983,7 @@ jobs:
             exit 1
           fi
       - name: Setup uv with cache
-        uses: ./
+        uses: $/
         with:
           enable-cache: true
           cache-python: true
@@ -1014,7 +1000,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: test-cache-python-installs
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Verify Python install dir does not exist
@@ -1025,7 +1011,7 @@ jobs:
           fi
       - name: Restore with cache
         id: restore
-        uses: ./
+        uses: $/
         with:
           enable-cache: true
           cache-python: true
@@ -1056,12 +1042,9 @@ jobs:
             expected-python-dir: "D:\\a\\_temp\\uv-python-dir"
     runs-on: ${{ matrix.inputs.os }}
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
       - name: Install latest version
         id: setup-uv
-        uses: ./
+        uses: $/
       - name: Check Python dir is expected dir
         run: |
           if [ "$UV_PYTHON_INSTALL_DIR" != "${{ matrix.inputs.expected-python-dir }}" ]; then
@@ -1072,25 +1055,29 @@ jobs:
       - name: Install python works
         run: uv python install
 
-  test-act:
+  test-workflow-run:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Install act
         run: gh extension install https://github.com/nektos/gh-act
         env:
           GH_TOKEN: ${{ github.token }}
-      - name: Run test-uvx with act
+      - name: Verify workflow_run disables automatic caching with act
-        run: gh act -j test-uvx -P ubuntu-latest=catthehacker/ubuntu:act-latest
+        run: |
+          gh act workflow_run \
+            -W __tests__/workflows/workflow-run.yml \
+            -P ubuntu-latest=catthehacker/ubuntu:act-latest \
+            --env RUNNER_ENVIRONMENT=github-hosted
         env:
           GH_TOKEN: ${{ github.token }}
 
   validate-typings:
     runs-on: "ubuntu-latest"
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Validate typings
@@ -1107,6 +1094,7 @@ jobs:
       - test-from-working-directory-version
       - test-malformed-pyproject-file-fallback
       - test-version-file-version
+      - test-tool-versions-python-version
       - test-checksum
       - test-with-explicit-token
       - test-uvx
@@ -1142,7 +1130,7 @@ jobs:
       - test-cache-python-installs
       - test-restore-python-installs
       - test-python-install-dir
-      - test-act
+      - test-workflow-run
       - validate-typings
     if: always()
     steps:

.github/workflows/update-docs.yml

@@ -18,7 +18,7 @@ jobs:
       contents: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           fetch-depth: 0
           persist-credentials: true
@@ -60,20 +60,8 @@ jobs:
           else
               echo "changes-exist=false" >> "$GITHUB_OUTPUT"
           fi
-      - name: Commit and push changes
-        if: ${{ steps.changes-exist.outputs.changes-exist == 'true' }}
-        id: commit-and-push
-        continue-on-error: true
-        run: |
-          git config user.name "$GITHUB_ACTOR"
-          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
-          git add .
-          git commit -m "docs: update version references to $NEW_VERSION"
-          git push origin HEAD:refs/heads/main
-        env:
-          NEW_VERSION: ${{ steps.tag-info.outputs.tag }}
       - name: Create Pull Request
-        if: ${{ steps.changes-exist.outputs.changes-exist == 'true' && steps.commit-and-push.outcome != 'success' }}
+        if: ${{ steps.changes-exist.outputs.changes-exist == 'true' }}
         uses: peter-evans/create-pull-request@5f6978faf089d4d20b00c7766989d076bb2fc7f1 # v8.1.1
         with:
           commit-message: "docs: update version references to ${{ steps.tag-info.outputs.tag }}"

.github/workflows/update-known-checksums.yml

@@ -15,7 +15,7 @@ jobs:
       contents: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: true
       - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
@@ -26,7 +26,7 @@ jobs:
         id: update-known-checksums
         run:
           node dist/update-known-checksums/index.cjs
-          src/download/checksum/known-checksums.ts
+          src/download/checksum/known-checksums.json
       - name: Check for changes
         id: changes-exist
         run: |
@@ -39,21 +39,8 @@ jobs:
       - name: Compile changes
         if: ${{ steps.changes-exist.outputs.changes-exist == 'true' }}
         run: npm ci --ignore-scripts && npm run all
-      - name: Commit and push changes
-        if: ${{ steps.changes-exist.outputs.changes-exist == 'true' }}
-        id: commit-and-push
-        continue-on-error: true
-        run: |
-          git config user.name "$GITHUB_ACTOR"
-          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
-          git add .
-          git commit -m "chore: update known checksums for $LATEST_VERSION"
-          git push origin HEAD:refs/heads/main
-        env:
-          LATEST_VERSION: ${{ steps.update-known-checksums.outputs.latest-version }}
-
       - name: Create Pull Request
-        if: ${{ steps.changes-exist.outputs.changes-exist == 'true' && steps.commit-and-push.outcome != 'success' }}
+        if: ${{ steps.changes-exist.outputs.changes-exist == 'true' }}
         uses: peter-evans/create-pull-request@5f6978faf089d4d20b00c7766989d076bb2fc7f1 # v8.1.1
         with:
           commit-message: "chore: update known checksums"

.npmrc

@@ -0,0 +1,3 @@
+engine-strict = true
+ignore-scripts = true
+min-release-age = 7

.nvmrc

@@ -1 +1 @@
-24
+24.19.0

README.md

@@ -26,7 +26,7 @@ Set up your GitHub Actions workflow with a specific version of [uv](https://docs
 
 ```yaml
 - name: Install the latest version of uv
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
 ```
 
 If you do not specify a version, this action will look for a [required-version](https://docs.astral.sh/uv/reference/settings/#required-version)
@@ -42,18 +42,18 @@ Have a look under [Advanced Configuration](#advanced-configuration) for detailed
 
 ```yaml
 - name: Install uv with all available options
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
-    # The version of uv to install (default: searches for version in config files, then latest)
+    # The version of uv to install, e.g., "0.5.0", "latest", or "latest-known" (default: searches for version in config files, then latest)
     version: ""
 
-    # Path to a file containing the version of uv to install, e.g., uv.toml, pyproject.toml, .tool-versions, requirements.txt or uv.lock (default: searches uv.toml then pyproject.toml)
+    # Path to a file containing the version of uv to install, e.g., uv.toml, pyproject.toml, .tool-versions, requirements.txt or uv.lock. A selected .tool-versions file can also provide the Python version (default: searches uv.toml then pyproject.toml)
     version-file: ""
 
     # Resolution strategy when resolving version ranges: 'highest' or 'lowest'
     resolution-strategy: "highest"
 
-    # The version of Python to set UV_PYTHON to
+    # The version of Python to set UV_PYTHON to (overrides the Python version from .tool-versions)
     python-version: ""
 
     # Use uv venv to activate a venv ready to be used by later steps
@@ -74,7 +74,7 @@ Have a look under [Advanced Configuration](#advanced-configuration) for detailed
     # Used when downloading uv from GitHub releases
     github-token: ${{ github.token }}
 
-    # Enable uploading of the uv cache: true, false, or auto (enabled on GitHub-hosted runners, disabled on self-hosted runners)
+    # Enable the GitHub Actions cache for uv: true, false, or auto (enabled on GitHub-hosted runners except for release, tag push, pull_request_target, and workflow_run events; disabled on self-hosted runners)
     enable-cache: "auto"
 
     # Glob pattern to match files relative to the repository root to control the cache
@@ -144,11 +144,30 @@ Have a look under [Advanced Configuration](#advanced-configuration) for detailed
 
 You can use the input `python-version` to set the environment variable `UV_PYTHON` for the rest of your workflow
 
-This will override any python version specifications in `pyproject.toml` and `.python-version`
+This will override any python version specifications in `pyproject.toml`, `.python-version`, and
+an explicitly selected `.tool-versions` file.
+
+When `version-file` points to `.tool-versions`, its `python` entry is used if neither
+`python-version` nor `UV_PYTHON` is set:
+
+```text
+uv 0.12.3
+python 3.13
+```
+
+```yaml
+- uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
+  with:
+    version-file: ".tool-versions"
+```
+
+Only a single Python version is supported. Filesystem paths are not supported for uv or Python.
+Multiple Python fallback versions and the asdf `ref:`, `path:`, and `system` forms are ignored with
+a warning.
 
 ```yaml
 - name: Install the latest version of uv and set the python version to 3.13t
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     python-version: 3.13t
 - run: uv pip install --python=3.13t pip
@@ -166,7 +185,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - name: Install the latest version of uv and set the python version
-        uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+        uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
         with:
           python-version: ${{ matrix.python-version }}
       - name: Test with python ${{ matrix.python-version }}
@@ -183,7 +202,7 @@ It also controls where [the venv gets created](#activate-environment), unless `v
 
 ```yaml
 - name: Install uv based on the config files in the working-directory
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     working-directory: my/subproject/dir
 ```
@@ -225,7 +244,7 @@ For example:
 - name: Checkout the repository
   uses: actions/checkout@main
 - name: Install the latest version of uv
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     enable-cache: true
 - name: Test
@@ -237,7 +256,7 @@ To install a specific version of Python, use
 
 ```yaml
 - name: Install the latest version of uv
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     enable-cache: true
 - name: Install Python 3.12
@@ -256,7 +275,7 @@ output:
   uses: actions/checkout@main
 - name: Install the default version of uv
   id: setup-uv
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
 - name: Print the installed version
   run: echo "Installed uv version is ${{ steps.setup-uv.outputs.uv-version }}"
 ```

__tests__/download/checksum/checksum.test.ts

@@ -40,9 +40,9 @@ it.each<KnownVersionFixture>([
     known: false,
     version: "0.0.15",
   },
-])("isknownVersion should return $known for version $version", ({
+])(
-  version,
+  "isknownVersion should return $known for version $version",
-  known,
+  ({ version, known }) => {
-}) => {
+    expect(isknownVersion(version)).toBe(known);
-  expect(isknownVersion(version)).toBe(known);
+  },
-});
+);

__tests__/download/checksum/known-version.test.ts

@@ -0,0 +1,20 @@
+import { expect, it, jest } from "@jest/globals";
+
+jest.unstable_mockModule(
+  "../../../src/download/checksum/known-checksums",
+  () => ({
+    KNOWN_CHECKSUMS: {
+      "aarch64-apple-darwin-1.9.0": "checksum",
+      "x86_64-unknown-linux-gnu-1.8.0": "checksum",
+      "x86_64-unknown-linux-gnu-1.10.0": "checksum",
+    },
+  }),
+);
+
+const { getLatestKnownVersion } = await import(
+  "../../../src/download/checksum/known-version"
+);
+
+it("returns the highest version with a built-in checksum", () => {
+  expect(getLatestKnownVersion()).toBe("1.10.0");
+});

__tests__/download/checksum/update-known-checksums.test.ts

@@ -0,0 +1,27 @@
+import { promises as fs } from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { expect, test } from "@jest/globals";
+import { updateChecksums } from "../../../src/download/checksum/update-known-checksums";
+
+test("serializes checksum entries as JSON data", async () => {
+  const tempDirectory = await fs.mkdtemp(
+    path.join(os.tmpdir(), "setup-uv-checksums-test-"),
+  );
+  const outputPath = path.join(tempDirectory, "known-checksums.json");
+  const key = 'platform-1.0.0"\n};\nglobalThis.compromised = true;';
+  const checksum = 'checksum"\\\nvalue';
+
+  try {
+    await updateChecksums(outputPath, [
+      { checksum, key },
+      { checksum: "duplicate", key },
+    ]);
+
+    const content = await fs.readFile(outputPath, "utf8");
+    expect(JSON.parse(content)).toEqual({ [key]: checksum });
+    expect(content.endsWith("\n")).toBe(true);
+  } finally {
+    await fs.rm(tempDirectory, { force: true, recursive: true });
+  }
+});

__tests__/download/download-version.test.ts

@@ -55,6 +55,12 @@ jest.unstable_mockModule("../../src/download/checksum/checksum", () => ({
   validateChecksum: mockValidateChecksum,
 }));
 
+const mockGetLatestKnownVersion = jest.fn(() => "0.9.25");
+
+jest.unstable_mockModule("../../src/download/checksum/known-version", () => ({
+  getLatestKnownVersion: mockGetLatestKnownVersion,
+}));
+
 const { downloadVersion, resolveVersion, rewriteToMirror } = await import(
   "../../src/download/download-version"
 );
@@ -72,6 +78,7 @@ describe("download-version", () => {
     mockGetFirstMatchingVersion.mockReset();
     mockGetArtifact.mockReset();
     mockValidateChecksum.mockReset();
+    mockGetLatestKnownVersion.mockClear();
 
     mockDownloadTool.mockResolvedValue("/tmp/downloaded");
     mockExtractTar.mockResolvedValue("/tmp/extracted");
@@ -90,6 +97,16 @@ describe("download-version", () => {
       expect(mockGetLatestVersion).toHaveBeenCalledWith(undefined);
     });
 
+    it("resolves latest-known without reading the manifest", async () => {
+      const version = await resolveVersion("latest-known", undefined);
+
+      expect(version).toBe("0.9.25");
+      expect(mockGetLatestKnownVersion).toHaveBeenCalledTimes(1);
+      expect(mockGetLatestVersion).not.toHaveBeenCalled();
+      expect(mockGetAllVersions).not.toHaveBeenCalled();
+      expect(mockGetFirstMatchingVersion).not.toHaveBeenCalled();
+    });
+
     it("stops at the first matching version in the default manifest", async () => {
       mockGetFirstMatchingVersion.mockImplementation(
         (predicate: (version: string) => boolean) =>

__tests__/download/manifest.test.ts

@@ -1,4 +1,11 @@
-import { beforeEach, describe, expect, it, jest } from "@jest/globals";
+import {
+  afterEach,
+  beforeEach,
+  describe,
+  expect,
+  it,
+  jest,
+} from "@jest/globals";
 
 // biome-ignore lint/suspicious/noExplicitAny: Mock requires flexible typing in tests.
 const mockFetch = jest.fn<any>();
@@ -13,6 +20,7 @@ jest.unstable_mockModule("../../src/utils/fetch", () => ({
 }));
 
 const {
+  MANIFEST_FETCH_ATTEMPTS,
   clearManifestCache,
   fetchManifest,
   getAllVersions,
@@ -73,6 +81,10 @@ describe("manifest", () => {
     mockFetch.mockReset();
   });
 
+  afterEach(() => {
+    jest.useRealTimers();
+  });
+
   describe("fetchManifest", () => {
     it("fetches and parses manifest data", async () => {
       mockFetch.mockResolvedValue(
@@ -86,6 +98,34 @@ describe("manifest", () => {
       expect(versions[1]?.version).toBe("0.9.25");
     });
 
+    it("retries network failures", async () => {
+      jest.useFakeTimers();
+      mockFetch
+        .mockRejectedValueOnce(new Error("request timed out"))
+        .mockResolvedValueOnce(
+          createMockResponse(true, 200, "OK", sampleManifestResponse),
+        );
+
+      const result = fetchManifest();
+      await jest.runAllTimersAsync();
+
+      await expect(result).resolves.toHaveLength(2);
+      expect(mockFetch).toHaveBeenCalledTimes(2);
+    });
+
+    it("stops after the configured number of network failures", async () => {
+      jest.useFakeTimers();
+      mockFetch.mockRejectedValue(new Error("request timed out"));
+
+      const result = expect(fetchManifest()).rejects.toThrow(
+        "request timed out",
+      );
+      await jest.runAllTimersAsync();
+
+      await result;
+      expect(mockFetch).toHaveBeenCalledTimes(MANIFEST_FETCH_ATTEMPTS);
+    });
+
     it("throws on a failed fetch", async () => {
       mockFetch.mockResolvedValue(
         createMockResponse(false, 500, "Internal Server Error", ""),

__tests__/fixtures/.tool-versions

@@ -1 +1,2 @@
 uv 0.5.15
+python 3.13.1t

__tests__/utils/inputs.test.ts

@@ -12,10 +12,13 @@ import {
 
 let mockInputs: Record<string, string> = {};
 const tempDirs: string[] = [];
+const ORIGINAL_GITHUB_EVENT_NAME = process.env.GITHUB_EVENT_NAME;
+const ORIGINAL_GITHUB_REF = process.env.GITHUB_REF;
 const ORIGINAL_HOME = process.env.HOME;
 const ORIGINAL_RUNNER_ENVIRONMENT = process.env.RUNNER_ENVIRONMENT;
 const ORIGINAL_RUNNER_TEMP = process.env.RUNNER_TEMP;
 const ORIGINAL_UV_CACHE_DIR = process.env.UV_CACHE_DIR;
+const ORIGINAL_UV_PYTHON = process.env.UV_PYTHON;
 const ORIGINAL_UV_PYTHON_INSTALL_DIR = process.env.UV_PYTHON_INSTALL_DIR;
 
 const mockDebug = jest.fn();
@@ -52,10 +55,13 @@ function createTempProject(files: Record<string, string> = {}): string {
 function resetEnvironment(): void {
   jest.clearAllMocks();
   mockInputs = {};
+  delete process.env.GITHUB_EVENT_NAME;
+  delete process.env.GITHUB_REF;
   process.env.HOME = "/home/testuser";
   delete process.env.RUNNER_ENVIRONMENT;
   delete process.env.RUNNER_TEMP;
   delete process.env.UV_CACHE_DIR;
+  delete process.env.UV_PYTHON;
   delete process.env.UV_PYTHON_INSTALL_DIR;
 }
 
@@ -64,10 +70,13 @@ function restoreEnvironment(): void {
     fs.rmSync(dir, { force: true, recursive: true });
   }
 
+  process.env.GITHUB_EVENT_NAME = ORIGINAL_GITHUB_EVENT_NAME;
+  process.env.GITHUB_REF = ORIGINAL_GITHUB_REF;
   process.env.HOME = ORIGINAL_HOME;
   process.env.RUNNER_ENVIRONMENT = ORIGINAL_RUNNER_ENVIRONMENT;
   process.env.RUNNER_TEMP = ORIGINAL_RUNNER_TEMP;
   process.env.UV_CACHE_DIR = ORIGINAL_UV_CACHE_DIR;
+  process.env.UV_PYTHON = ORIGINAL_UV_PYTHON;
   process.env.UV_PYTHON_INSTALL_DIR = ORIGINAL_UV_PYTHON_INSTALL_DIR;
 }
 
@@ -94,6 +103,109 @@ describe("loadInputs", () => {
     expect(inputs.resolutionStrategy).toBe("highest");
   });
 
+  it("uses the Python version from an explicitly selected .tool-versions file", () => {
+    mockInputs["working-directory"] = createTempProject({
+      ".tool-versions": "uv 0.12.3\npython 3.13.1t\n",
+    });
+    mockInputs["version-file"] = ".tool-versions";
+
+    const inputs = loadInputs();
+
+    expect(inputs.pythonVersion).toBe("3.13.1t");
+  });
+
+  it("prefers the python-version input over .tool-versions", () => {
+    mockInputs["working-directory"] = createTempProject({
+      ".tool-versions": "uv 0.12.3\npython 3.13\n",
+    });
+    mockInputs["version-file"] = ".tool-versions";
+    mockInputs["python-version"] = "3.12";
+
+    const inputs = loadInputs();
+
+    expect(inputs.pythonVersion).toBe("3.12");
+  });
+
+  it("preserves UV_PYTHON instead of overriding it from .tool-versions", () => {
+    mockInputs["working-directory"] = createTempProject({
+      ".tool-versions": "uv 0.12.3\npython 3.13\n",
+    });
+    mockInputs["version-file"] = ".tool-versions";
+    process.env.UV_PYTHON = "3.11";
+
+    const inputs = loadInputs();
+
+    expect(inputs.pythonVersion).toBe("");
+    expect(process.env.UV_PYTHON).toBe("3.11");
+  });
+
+  it("does not discover .tool-versions from the working directory", () => {
+    mockInputs["working-directory"] = createTempProject({
+      ".tool-versions": "uv 0.12.3\npython 3.13\n",
+    });
+
+    const inputs = loadInputs();
+
+    expect(inputs.pythonVersion).toBe("");
+  });
+
+  it.each(["pull_request_target", "workflow_run", "release"])(
+    "disables automatic caching for the %s event",
+    (eventName) => {
+      mockInputs["working-directory"] = "/workspace";
+      mockInputs["enable-cache"] = "auto";
+      process.env.RUNNER_ENVIRONMENT = "github-hosted";
+      process.env.RUNNER_TEMP = "/runner-temp";
+      process.env.GITHUB_EVENT_NAME = eventName;
+
+      const inputs = loadInputs();
+
+      expect(inputs.enableCache).toBe(false);
+      expect(mockInfo).toHaveBeenCalledWith(
+        `Caching is disabled for the ${eventName} event`,
+      );
+    },
+  );
+
+  it("disables automatic caching for tag pushes", () => {
+    mockInputs["working-directory"] = "/workspace";
+    mockInputs["enable-cache"] = "auto";
+    process.env.RUNNER_ENVIRONMENT = "github-hosted";
+    process.env.RUNNER_TEMP = "/runner-temp";
+    process.env.GITHUB_EVENT_NAME = "push";
+    process.env.GITHUB_REF = "refs/tags/v1.0.0";
+
+    const inputs = loadInputs();
+
+    expect(inputs.enableCache).toBe(false);
+    expect(mockInfo).toHaveBeenCalledWith("Caching is disabled for tag pushes");
+  });
+
+  it("enables automatic caching for branch pushes", () => {
+    mockInputs["working-directory"] = "/workspace";
+    mockInputs["enable-cache"] = "auto";
+    process.env.RUNNER_ENVIRONMENT = "github-hosted";
+    process.env.RUNNER_TEMP = "/runner-temp";
+    process.env.GITHUB_EVENT_NAME = "push";
+    process.env.GITHUB_REF = "refs/heads/main";
+
+    const inputs = loadInputs();
+
+    expect(inputs.enableCache).toBe(true);
+  });
+
+  it("honors explicitly enabled caching for sensitive events", () => {
+    mockInputs["working-directory"] = "/workspace";
+    mockInputs["enable-cache"] = "true";
+    process.env.RUNNER_ENVIRONMENT = "github-hosted";
+    process.env.RUNNER_TEMP = "/runner-temp";
+    process.env.GITHUB_EVENT_NAME = "release";
+
+    const inputs = loadInputs();
+
+    expect(inputs.enableCache).toBe(true);
+  });
+
   it("uses cache-dir from pyproject.toml when present", () => {
     mockInputs["working-directory"] = createTempProject({
       "pyproject.toml": `[project]

__tests__/version/requirements-file.test.ts

@@ -15,15 +15,18 @@ test("ignores dependencies starting with uv", async () => {
 test.each([
   ["without space before marker", "uv==0.11.20; sys_platform != 'emscripten'"],
   ["with space before marker", "uv==0.11.20 ; sys_platform != 'emscripten'"],
-])("strips PEP 508 markers from pyproject dependency groups %s", (_, dependency) => {
+])(
-  const parsedVersion = getUvVersionFromPyprojectContent(`[dependency-groups]
+  "strips PEP 508 markers from pyproject dependency groups %s",
+  (_, dependency) => {
+    const parsedVersion = getUvVersionFromPyprojectContent(`[dependency-groups]
 test = [
   "${dependency}",
 ]
 `);
 
-  expect(parsedVersion).toBe("==0.11.20");
+    expect(parsedVersion).toBe("==0.11.20");
-});
+  },
+);
 
 test("strips PEP 508 markers from requirements dependencies", () => {
   const parsedVersion = getUvVersionFromRequirementsText(

__tests__/version/tool-versions-file.test.ts

@@ -21,6 +21,11 @@ async function getVersionFromToolVersions(filePath: string) {
   return getUvVersionFromToolVersions(filePath);
 }
 
+async function getPythonVersionFromToolVersions(filePath: string) {
+  const module = await import("../../src/version/tool-versions-file");
+  return module.getPythonVersionFromToolVersions(filePath);
+}
+
 describe("getUvVersionFromToolVersions", () => {
   beforeEach(() => {
     jest.resetModules();
@@ -61,8 +66,8 @@ describe("getUvVersionFromToolVersions", () => {
     expect(result).toBe("0.3.0");
   });
 
-  it("should skip commented lines", async () => {
+  it("should skip comments", async () => {
-    const fileContent = "# uv 0.1.0\npython 3.11.0\nuv 0.2.0";
+    const fileContent = "# uv 0.1.0\npython 3.11.0\nuv 0.2.0 # inline comment";
     mockReadFileSync.mockReturnValue(fileContent);
 
     const result = await getVersionFromToolVersions(".tool-versions");
@@ -108,6 +113,20 @@ describe("getUvVersionFromToolVersions", () => {
     );
   });
 
+  it.each(["/my/python/exploit", "my/exploited/uv", "C:\\exploited\\uv"])(
+    "should warn and return undefined for path %s",
+    async (version) => {
+      mockReadFileSync.mockReturnValue(`uv ${version}`);
+
+      const result = await getVersionFromToolVersions(".tool-versions");
+
+      expect(result).toBeUndefined();
+      expect(mockWarning).toHaveBeenCalledWith(
+        `The uv version ${version} in .tool-versions is not supported. Paths are not allowed.`,
+      );
+    },
+  );
+
   it("should handle file path with .tool-versions extension", async () => {
     const fileContent = "uv 0.1.0";
     mockReadFileSync.mockReturnValue(fileContent);
@@ -121,3 +140,72 @@ describe("getUvVersionFromToolVersions", () => {
     );
   });
 });
+
+describe("getPythonVersionFromToolVersions", () => {
+  beforeEach(() => {
+    jest.resetModules();
+    jest.clearAllMocks();
+  });
+
+  it("should return version for a valid Python entry", async () => {
+    mockReadFileSync.mockReturnValue(
+      "nodejs 24.0.0\r\npython v3.13.1t # use free-threaded Python\r\nuv 0.12.3",
+    );
+
+    const result = await getPythonVersionFromToolVersions(".tool-versions");
+
+    expect(result).toBe("3.13.1t");
+  });
+
+  it("should return the first matching Python version", async () => {
+    mockReadFileSync.mockReturnValue("python 3.12\npython 3.13");
+
+    const result = await getPythonVersionFromToolVersions(".tool-versions");
+
+    expect(result).toBe("3.12");
+  });
+
+  it("should return undefined when no Python entry is found", async () => {
+    mockReadFileSync.mockReturnValue("uv 0.12.3\nnodejs 24.0.0");
+
+    const result = await getPythonVersionFromToolVersions(".tool-versions");
+
+    expect(result).toBeUndefined();
+  });
+
+  it("should warn and return undefined for multiple Python versions", async () => {
+    mockReadFileSync.mockReturnValue("python 3.13 3.12 system");
+
+    const result = await getPythonVersionFromToolVersions(".tool-versions");
+
+    expect(result).toBeUndefined();
+    expect(mockWarning).toHaveBeenCalledWith(
+      "Multiple Python versions in .tool-versions are not supported. The Python entry will be ignored.",
+    );
+  });
+
+  it.each([
+    "ref:main",
+    "path:~/src/python",
+    "system",
+    "/my/python/exploit",
+    "my/exploited/python",
+    "C:\\exploited\\python",
+  ])("should warn and return undefined for %s", async (version) => {
+    mockReadFileSync.mockReturnValue(`python ${version}`);
+
+    const result = await getPythonVersionFromToolVersions(".tool-versions");
+
+    expect(result).toBeUndefined();
+    expect(mockWarning).toHaveBeenCalledWith(
+      `The Python version ${version} in .tool-versions is not supported. The Python entry will be ignored.`,
+    );
+  });
+
+  it("should return undefined for non-.tool-versions files", async () => {
+    const result = await getPythonVersionFromToolVersions(".python-version");
+
+    expect(result).toBeUndefined();
+    expect(mockReadFileSync).not.toHaveBeenCalled();
+  });
+});

__tests__/workflows/workflow-run.yml

@@ -0,0 +1,42 @@
+name: "test workflow_run caching"
+
+on: # zizmor: ignore[dangerous-triggers] this workflow is a test fixture executed by act only
+  workflow_run:
+    workflows:
+      - test
+    types:
+      - completed
+
+permissions:
+  contents: read
+
+jobs:
+  test-cache-disabled:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+      - name: Setup uv with automatic caching
+        id: setup-uv
+        uses: ./
+      - name: Verify automatic caching is disabled
+        env:
+          CACHE_KEY: ${{ steps.setup-uv.outputs.cache-key }}
+        run: |
+          if [ "$GITHUB_EVENT_NAME" != "workflow_run" ]; then
+            echo "Expected workflow_run event, got: $GITHUB_EVENT_NAME"
+            exit 1
+          fi
+          if [ "$RUNNER_ENVIRONMENT" != "github-hosted" ]; then
+            echo "Expected a simulated GitHub-hosted runner, got: $RUNNER_ENVIRONMENT"
+            exit 1
+          fi
+          if [ -n "$CACHE_KEY" ]; then
+            echo "Cache key should not be set for a workflow_run event: $CACHE_KEY"
+            exit 1
+          fi
+          if [ -n "$UV_CACHE_DIR" ]; then
+            echo "UV_CACHE_DIR should not be set for a workflow_run event: $UV_CACHE_DIR"
+            exit 1
+          fi

action.yml

@@ -4,13 +4,13 @@ description:
 author: "astral-sh"
 inputs:
   version:
-    description: "The version of uv to install e.g., `0.5.0` Defaults to the version in pyproject.toml or 'latest'."
+    description: "The version of uv to install, e.g., `0.5.0`, `latest`, or `latest-known`. Defaults to the version in pyproject.toml or `latest`."
     default: ""
   version-file:
-    description: "Path to a file containing the version of uv to install, e.g., uv.toml, pyproject.toml, .tool-versions, requirements.txt or uv.lock. Defaults to searching for uv.toml and if not found pyproject.toml."
+    description: "Path to a file containing the version of uv to install, e.g., uv.toml, pyproject.toml, .tool-versions, requirements.txt or uv.lock. A selected .tool-versions file can also provide the Python version. Defaults to searching for uv.toml and if not found pyproject.toml."
     default: ""
   python-version:
-    description: "The version of Python to set UV_PYTHON to"
+    description: "The version of Python to set UV_PYTHON to. Overrides the Python version from .tool-versions."
     required: false
   activate-environment:
     description: "Use uv venv to activate a venv ready to be used by later steps. "
@@ -33,7 +33,7 @@ inputs:
     required: false
     default: ${{ github.token }}
   enable-cache:
-    description: "Enable uploading of the uv cache"
+    description: "Enable the GitHub Actions cache for uv. 'auto' enables caching on GitHub-hosted runners except for release, tag push, pull_request_target, and workflow_run events."
     default: "auto"
   cache-dependency-glob:
     description:

biome.json

@@ -1,5 +1,5 @@
 {
-  "$schema": "https://biomejs.dev/schemas/2.5.1/schema.json",
+  "$schema": "https://biomejs.dev/schemas/2.5.7/schema.json",
   "assist": {
     "actions": {
       "source": {

docs/advanced-version-configuration.md

@@ -6,16 +6,29 @@ This document covers advanced options for configuring which version of uv to ins
 
 ```yaml
 - name: Install the latest version of uv
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     version: "latest"
 ```
 
+## Install the latest version with a checksum verified by this action
+
+Use `latest-known` to install the newest uv version whose checksums were bundled with the version of setup-uv used by your workflow. Version resolution is performed locally without fetching the latest release, so updating setup-uv also updates the version selected by `latest-known`.
+
+When `manifest-file` is set, `latest-known` still selects a version from setup-uv's bundled checksum table, but the artifact and checksum come from the custom manifest.
+
+```yaml
+- name: Install the latest version of uv known to setup-uv
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
+  with:
+    version: "latest-known"
+```
+
 ## Install a specific version
 
 ```yaml
 - name: Install a specific version of uv
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     version: "0.4.4"
 ```
@@ -28,21 +41,21 @@ to install the latest version that satisfies the range.
 
 ```yaml
 - name: Install a semver range of uv
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     version: ">=0.4.0"
 ```
 
 ```yaml
 - name: Pinning a minor version of uv
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     version: "0.4.x"
 ```
 
 ```yaml
 - name: Install a pep440-specifier-satisfying version of uv
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     version: ">=0.4.25,<0.5"
 ```
@@ -54,7 +67,7 @@ You can change this behavior using the `resolution-strategy` input:
 
 ```yaml
 - name: Install the lowest compatible version of uv
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     version: ">=0.4.0"
     resolution-strategy: "lowest"
@@ -72,11 +85,14 @@ You can use the `version-file` input to specify a file that contains the version
 This can either be a `pyproject.toml` or `uv.toml` file which defines a `required-version` or
 uv defined as a dependency in `pyproject.toml` or `requirements.txt`.
 
-[asdf](https://asdf-vm.com/) `.tool-versions` is also supported, but without the `ref` syntax.
+[asdf](https://asdf-vm.com/) `.tool-versions` is also supported for selecting uv. If neither
+`python-version` nor `UV_PYTHON` is set, the `python` entry from the selected file is also exported
+as `UV_PYTHON`. Only a single Python version is supported; multiple fallback versions and the asdf
+`ref:`, `path:`, and `system` forms are ignored with a warning.
 
 ```yaml
 - name: Install uv based on the version defined in pyproject.toml
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     version-file: "pyproject.toml"
 ```
@@ -87,7 +103,7 @@ silently picking up a newer uv until the lockfile is updated.
 
 ```yaml
 - name: Install uv based on the version locked in uv.lock
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     version-file: "uv.lock"
 ```

docs/caching.md

@@ -23,7 +23,7 @@ The computed cache key is available as the `cache-key` output:
 ```yaml
 - name: Setup uv
   id: setup-uv
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     enable-cache: true
 - name: Print cache key
@@ -38,7 +38,10 @@ The computed cache key is available as the `cache-key` output:
 
 If you enable caching, the [uv cache](https://docs.astral.sh/uv/concepts/cache/) will be uploaded to
 the GitHub Actions cache. This can speed up runs that reuse the cache by several minutes.
-Caching is enabled by default on GitHub-hosted runners.
+With the default `enable-cache: auto`, caching is enabled on GitHub-hosted runners except for
+`release`, tag push, `pull_request_target`, and `workflow_run` events. Caching is disabled for these
+events to prevent insecure or release-sensitive jobs from restoring potentially poisoned caches.
+Set `enable-cache: true` to explicitly enable caching for any event.
 
 > [!TIP]
 >
@@ -50,7 +53,7 @@ You can optionally define a custom cache key suffix.
 ```yaml
 - name: Enable caching and define a custom cache key suffix
   id: setup-uv
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     enable-cache: true
     cache-suffix: "optional-suffix"
@@ -89,7 +92,7 @@ changes. If you use relative paths, they are relative to the working directory.
 
 ```yaml
 - name: Define a cache dependency glob
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     enable-cache: true
     cache-dependency-glob: "**/pyproject.toml"
@@ -97,7 +100,7 @@ changes. If you use relative paths, they are relative to the working directory.
 
 ```yaml
 - name: Define a list of cache dependency globs
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     enable-cache: true
     cache-dependency-glob: |
@@ -107,7 +110,7 @@ changes. If you use relative paths, they are relative to the working directory.
 
 ```yaml
 - name: Define an absolute cache dependency glob
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     enable-cache: true
     cache-dependency-glob: "/tmp/my-folder/requirements*.txt"
@@ -115,7 +118,7 @@ changes. If you use relative paths, they are relative to the working directory.
 
 ```yaml
 - name: Never invalidate the cache
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     enable-cache: true
     cache-dependency-glob: ""
@@ -128,7 +131,7 @@ By default, the cache will be restored.
 
 ```yaml
 - name: Don't restore an existing cache
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     enable-cache: true
     restore-cache: false
@@ -142,7 +145,7 @@ By default, the cache will be saved.
 
 ```yaml
 - name: Don't save the cache after the run
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     enable-cache: true
     save-cache: false
@@ -168,7 +171,7 @@ It defaults to `setup-uv-cache` in the `TMP` dir, `D:\a\_temp\setup-uv-cache` on
 
 ```yaml
 - name: Define a custom uv cache path
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     cache-local-path: "/path/to/cache"
 ```
@@ -185,7 +188,7 @@ If you want to prune the cache before saving it, enable cache pruning with the `
 
 ```yaml
 - name: Prune the cache before saving it
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     enable-cache: true
     prune-cache: true
@@ -204,7 +207,7 @@ To force managed Python installs, set `UV_PYTHON_PREFERENCE=only-managed`.
 
 ```yaml
 - name: Cache Python installs
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     enable-cache: true
     cache-python: true
@@ -222,7 +225,7 @@ If you want to ignore this, set the `ignore-nothing-to-cache` input to `true`.
 
 ```yaml
 - name: Ignore nothing to cache
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     enable-cache: true
     ignore-nothing-to-cache: true

docs/customization.md

@@ -10,7 +10,7 @@ are automatically verified by this action. The sha256 hashes can be found on the
 
 ```yaml
 - name: Install a specific version and validate the checksum
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     version: "0.3.1"
     checksum: "e11b01402ab645392c7ad6044db63d37e4fd1e745e015306993b07695ea5f9f8"
@@ -39,7 +39,7 @@ The `archive_format` field is currently ignored.
 
 ```yaml
 - name: Use a custom manifest file
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     manifest-file: "https://example.com/my-custom-manifest.ndjson"
 ```
@@ -58,7 +58,7 @@ You can disable this by setting the `add-problem-matchers` input to `false`.
 
 ```yaml
 - name: Install the latest version of uv without problem matchers
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     add-problem-matchers: false
 ```

docs/environment-and-tools.md

@@ -9,7 +9,7 @@ This allows directly using it in later steps:
 
 ```yaml
 - name: Install the latest version of uv and activate the environment
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     activate-environment: true
 - run: uv pip install pip
@@ -20,7 +20,7 @@ By default, the venv is created at `.venv` inside the `working-directory`.
 You can customize the venv location with `venv-path`, for example to place it in the runner temp directory:
 
 ```yaml
-- uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+- uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     activate-environment: true
     venv-path: ${{ runner.temp }}/custom-venv
@@ -51,7 +51,7 @@ are not sufficient, you can provide a custom GitHub token with the necessary per
 
 ```yaml
 - name: Install the latest version of uv with a custom GitHub token
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     github-token: ${{ secrets.CUSTOM_GITHUB_TOKEN }}
 ```
@@ -69,7 +69,7 @@ input:
 
 ```yaml
 - name: Install the latest version of uv with a custom tool dir
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     tool-dir: "/path/to/tool/dir"
 ```
@@ -88,7 +88,7 @@ If you want to change this behaviour (especially on self-hosted runners) you can
 
 ```yaml
 - name: Install the latest version of uv with a custom tool bin dir
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     tool-bin-dir: "/path/to/tool-bin/dir"
 ```
@@ -105,7 +105,7 @@ This action supports expanding the `~` character to the user's home directory fo
 
 ```yaml
 - name: Expand the tilde character
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     cache-local-path: "~/path/to/cache"
     tool-dir: "~/path/to/tool/dir"
@@ -122,7 +122,7 @@ If you want to ignore this, set the `ignore-empty-workdir` input to `true`.
 
 ```yaml
 - name: Ignore empty workdir
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     ignore-empty-workdir: true
 ```
@@ -131,7 +131,7 @@ If you want to ignore this, set the `ignore-empty-workdir` input to `true`.
 
 This action sets several environment variables that influence uv's behavior and can be used by subsequent steps:
 
-- `UV_PYTHON`: Set when `python-version` input is specified. Controls which Python version uv uses.
+- `UV_PYTHON`: Set when `python-version` is specified or the selected `.tool-versions` file contains a supported `python` entry. Controls which Python version uv uses.
 - `UV_CACHE_DIR`: Set when caching is enabled (unless already configured in uv config files). Controls where uv stores its cache.
 - `UV_TOOL_DIR`: Set when `tool-dir` input is specified. Controls where uv installs tool environments.
 - `UV_TOOL_BIN_DIR`: Set when `tool-bin-dir` input is specified. Controls where uv installs tool binaries.
@@ -142,10 +142,11 @@ This action sets several environment variables that influence uv's behavior and
 
 - `UV_NO_MODIFY_PATH`: If set, prevents the action from modifying PATH. Cannot be used with `activate-environment`.
 - `UV_CACHE_DIR`: If already set, the action will respect it instead of setting its own cache directory.
+- `UV_PYTHON`: If already set and `python-version` is not specified, the action will respect it instead of using the `python` entry from `.tool-versions`.
 
 ```yaml
 - name: Example using environment variables
-  uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
+  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
   with:
     python-version: "3.12"
     tool-dir: "/custom/tool/dir"

package-lock.json

@@ -9,33 +9,36 @@
       "version": "1.0.0",
       "license": "MIT",
       "dependencies": {
-        "@actions/cache": "^6.1.0",
+        "@actions/cache": "^6.2.0",
         "@actions/core": "^3.0.0",
         "@actions/exec": "^3.0.0",
-        "@actions/glob": "^0.6.1",
+        "@actions/glob": "^0.7.0",
         "@actions/io": "^3.0.2",
         "@actions/tool-cache": "^4.0.0",
         "@renovatebot/pep440": "^5.0.0",
-        "smol-toml": "^1.7.0",
+        "smol-toml": "^1.7.1",
-        "undici": "^8.3.0"
+        "undici": "^8.10.0"
       },
       "devDependencies": {
-        "@biomejs/biome": "^2.5.1",
+        "@biomejs/biome": "^2.5.7",
         "@types/js-yaml": "^4.0.9",
-        "@types/node": "^26.1.1",
+        "@types/node": "^26.1.2",
-        "@types/semver": "^7.7.1",
+        "@types/semver": "^7.8.0",
         "@vercel/ncc": "^0.44.1",
         "esbuild": "^0.28.1",
         "jest": "^30.4.2",
-        "js-yaml": "^5.2.1",
+        "js-yaml": "^5.2.3",
         "ts-jest": "^29.4.11",
         "typescript": "^6.0.3"
+      },
+      "engines": {
+        "npm": ">=11.10.0"
       }
     },
     "node_modules/@actions/cache": {
-      "version": "6.1.0",
+      "version": "6.2.0",
-      "resolved": "https://registry.npmjs.org/@actions/cache/-/cache-6.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/@actions/cache/-/cache-6.2.0.tgz",
-      "integrity": "sha512-LVqybSbzhBp2uAETOQ3HnVjXA4AcjavgMH+LCr+cjgO+PZfciv/1QAgoW+esXBaAhvDid+vXeV70GGJpAh4V5Q==",
+      "integrity": "sha512-Nv0xWRmbxfDbAn/70flO/F6tj2Nv4XTYMAsQHiDFSojCDfso/Zni+fRKa14ToI9hnmOW/rQcY1WYb6wsM7Pgwg==",
       "license": "MIT",
       "dependencies": {
         "@actions/core": "^3.0.1",
@@ -49,6 +52,16 @@
         "semver": "^7.7.4"
       }
     },
+    "node_modules/@actions/cache/node_modules/@actions/glob": {
+      "version": "0.6.1",
+      "resolved": "https://registry.npmjs.org/@actions/glob/-/glob-0.6.1.tgz",
+      "integrity": "sha512-K4+2Ac5ILcf2ySdJCha+Pop9NcKjxqCL4xL4zI50dgB2PbXgC0+AcP011xfH4Of6b4QEJJg8dyZYv7zl4byTsw==",
+      "license": "MIT",
+      "dependencies": {
+        "@actions/core": "^3.0.0",
+        "minimatch": "^3.0.4"
+      }
+    },
     "node_modules/@actions/cache/node_modules/semver": {
       "version": "7.7.4",
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.4.tgz",
@@ -81,13 +94,49 @@
       }
     },
     "node_modules/@actions/glob": {
-      "version": "0.6.1",
+      "version": "0.7.0",
-      "resolved": "https://registry.npmjs.org/@actions/glob/-/glob-0.6.1.tgz",
+      "resolved": "https://registry.npmjs.org/@actions/glob/-/glob-0.7.0.tgz",
-      "integrity": "sha512-K4+2Ac5ILcf2ySdJCha+Pop9NcKjxqCL4xL4zI50dgB2PbXgC0+AcP011xfH4Of6b4QEJJg8dyZYv7zl4byTsw==",
+      "integrity": "sha512-+7s3wM+cXapDLmLL1NVWHawqcJOZzXZy2df/VhNn8DnZtS/x83iTCKaUn9F0llur4h3CII0AilvKKH4CMPL8Gw==",
       "license": "MIT",
       "dependencies": {
         "@actions/core": "^3.0.0",
-        "minimatch": "^3.0.4"
+        "minimatch": "^10.2.5"
+      }
+    },
+    "node_modules/@actions/glob/node_modules/balanced-match": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-4.0.4.tgz",
+      "integrity": "sha512-BLrgEcRTwX2o6gGxGOCNyMvGSp35YofuYzw9h1IMTRmKqttAZZVU67bdb9Pr2vUHA8+j3i2tJfjO6C6+4myGTA==",
+      "license": "MIT",
+      "engines": {
+        "node": "18 || 20 || >=22"
+      }
+    },
+    "node_modules/@actions/glob/node_modules/brace-expansion": {
+      "version": "5.0.9",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.9.tgz",
+      "integrity": "sha512-ScQ4IuvIEF1TMlP7Zt+vjJ//9zlPb2SDcxWxM3bk8s6t6GGdJ7KO1dCcTidOPJKePW30LE/2cT7wCyPho9/Wxg==",
+      "license": "MIT",
+      "dependencies": {
+        "balanced-match": "^4.0.2"
+      },
+      "engines": {
+        "node": "20 || >=22"
+      }
+    },
+    "node_modules/@actions/glob/node_modules/minimatch": {
+      "version": "10.2.6",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-10.2.6.tgz",
+      "integrity": "sha512-vpLQEs+VLCr1nU0BXS07maYoFwlDAH0gngQuuttxIwutDFEMHq2blX+8vpgxDdK3J1PwjCJiep77OitTZ4Ll1A==",
+      "license": "BlueOak-1.0.0",
+      "dependencies": {
+        "brace-expansion": "^5.0.8"
+      },
+      "engines": {
+        "node": "18 || 20 || >=22"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
       }
     },
     "node_modules/@actions/http-client": {
@@ -863,9 +912,9 @@
       "license": "MIT"
     },
     "node_modules/@biomejs/biome": {
-      "version": "2.5.1",
+      "version": "2.5.7",
-      "resolved": "https://registry.npmjs.org/@biomejs/biome/-/biome-2.5.1.tgz",
+      "resolved": "https://registry.npmjs.org/@biomejs/biome/-/biome-2.5.7.tgz",
-      "integrity": "sha512-IXWLCxKmae+rI7LOHS1B3EbVisQ6GRAWbhN9msa6KjNCyFWrvKZWR4oUdinaNssrV852OrSHuSPa95h1GPJc7Q==",
+      "integrity": "sha512-zr8K/DcY5tYsQOQwqMJ0AWElo6QgmgNI7idXgXLhevVszlt8RGVpesEJPqx3ThazLaOwjJ5Y8fz3BtH5fGZNsw==",
       "dev": true,
       "license": "MIT OR Apache-2.0",
       "bin": {
@@ -879,20 +928,20 @@
         "url": "https://opencollective.com/biome"
       },
       "optionalDependencies": {
-        "@biomejs/cli-darwin-arm64": "2.5.1",
+        "@biomejs/cli-darwin-arm64": "2.5.7",
-        "@biomejs/cli-darwin-x64": "2.5.1",
+        "@biomejs/cli-darwin-x64": "2.5.7",
-        "@biomejs/cli-linux-arm64": "2.5.1",
+        "@biomejs/cli-linux-arm64": "2.5.7",
-        "@biomejs/cli-linux-arm64-musl": "2.5.1",
+        "@biomejs/cli-linux-arm64-musl": "2.5.7",
-        "@biomejs/cli-linux-x64": "2.5.1",
+        "@biomejs/cli-linux-x64": "2.5.7",
-        "@biomejs/cli-linux-x64-musl": "2.5.1",
+        "@biomejs/cli-linux-x64-musl": "2.5.7",
-        "@biomejs/cli-win32-arm64": "2.5.1",
+        "@biomejs/cli-win32-arm64": "2.5.7",
-        "@biomejs/cli-win32-x64": "2.5.1"
+        "@biomejs/cli-win32-x64": "2.5.7"
       }
     },
     "node_modules/@biomejs/cli-darwin-arm64": {
-      "version": "2.5.1",
+      "version": "2.5.7",
-      "resolved": "https://registry.npmjs.org/@biomejs/cli-darwin-arm64/-/cli-darwin-arm64-2.5.1.tgz",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-darwin-arm64/-/cli-darwin-arm64-2.5.7.tgz",
-      "integrity": "sha512-npqDzvqv7vFaWRiNN1Te71siRgPaqS9MpqgYCdP/CrUbkJ7ApezaeaKjueKHRN/JH/6lRjJQAHi8acQDCAz22w==",
+      "integrity": "sha512-vxo/Ls3/PYdQWyLhYYcgMOCzQypAjcY+iihS8M0wW03l16TCLW4zqZzGo75gm1VdCMj38hTVZ31KBWrZ4G9dJw==",
       "cpu": [
         "arm64"
       ],
@@ -907,9 +956,9 @@
       }
     },
     "node_modules/@biomejs/cli-darwin-x64": {
-      "version": "2.5.1",
+      "version": "2.5.7",
-      "resolved": "https://registry.npmjs.org/@biomejs/cli-darwin-x64/-/cli-darwin-x64-2.5.1.tgz",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-darwin-x64/-/cli-darwin-x64-2.5.7.tgz",
-      "integrity": "sha512-RgwTqPAM8g2tn1j+b5oRjF/DbSBX8a4gwojtuG9XuhfK7GgomvZ9+T+tqjXiVbjLEeGJOoL6VEk8mvRTVeSybw==",
+      "integrity": "sha512-Cd3Ga61amT/Yl/0x8elP5hhGYaFy4bw6WuysTgf7oo8TA5tJ5A1k+DkVoJ2BHbTVil51gTX9VPzArnrlLJ3Kyg==",
       "cpu": [
         "x64"
       ],
@@ -924,9 +973,9 @@
       }
     },
     "node_modules/@biomejs/cli-linux-arm64": {
-      "version": "2.5.1",
+      "version": "2.5.7",
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       "optional": true
     },
@@ -7153,18 +7234,18 @@
       "dev": true
     },
     "@types/node": {
-      "version": "26.1.1",
+      "version": "26.1.2",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-26.1.1.tgz",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-26.1.2.tgz",
-      "integrity": "sha512-nxAkRSVkN1Y0JC1W8ky/fTfkGsMmcrRsbx+3XoZE+rMOX71kLYTV7fLXpqud1GpbpP5TuffXFqfX7fH2GgZREw==",
+      "integrity": "sha512-Vu4a5UFA9rIIFJ7rB/Vaafh9lrCQszopTCx6KjFboXTGQbPNasehVR5TEiithSDGyd1DEiUByggTZsg8jukeIg==",
       "dev": true,
       "requires": {
         "undici-types": "~8.3.0"
       }
     },
     "@types/semver": {
-      "version": "7.7.1",
+      "version": "7.8.0",
-      "resolved": "https://registry.npmjs.org/@types/semver/-/semver-7.7.1.tgz",
+      "resolved": "https://registry.npmjs.org/@types/semver/-/semver-7.8.0.tgz",
-      "integrity": "sha512-FmgJfu+MOcQ370SD0ev7EI8TlCAfKYU+B4m5T3yXc1CiRN94g/SZPtsCkk506aUDtlMnFZvasDwHHUcZUEaYuA==",
+      "integrity": "sha512-1mAINjtQCXXeLkJ9ehXkwOcBpqtLxiVtKhpUf83DdRNdQKV0iXZpaHYqRr7nj+wvxuJzoAmAwXI+sCNMv1CzLQ==",
       "dev": true
     },
     "@types/stack-utils": {
@@ -8627,9 +8708,9 @@
       "dev": true
     },
     "js-yaml": {
-      "version": "5.2.1",
+      "version": "5.2.3",
-      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-5.2.1.tgz",
+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-5.2.3.tgz",
-      "integrity": "sha512-zfLtNfQqxVqq3uaTqSkh4x4hZw3KHobGUA0fJUj4wawW8bsQLTVqpHdXSIzidh7o+4lEW36tANuAGdaFx6Zgnw==",
+      "integrity": "sha512-n+mUVyUX5bVv7G/G2zyIHOhdxfuU1dY2NOFzTQUWiMUbFss8b57NFlgCCaggU78wSw5KVS9cllzeLyzyR+n5nw==",
       "dev": true,
       "requires": {
         "argparse": "^2.0.1"
@@ -9035,9 +9116,9 @@
       "dev": true
     },
     "smol-toml": {
-      "version": "1.7.0",
+      "version": "1.7.1",
-      "resolved": "https://registry.npmjs.org/smol-toml/-/smol-toml-1.7.0.tgz",
+      "resolved": "https://registry.npmjs.org/smol-toml/-/smol-toml-1.7.1.tgz",
-      "integrity": "sha512-aqVvWoyO21L23mb+drl4RmMXbf6N7FdHjAhTRA9ZBL7apWBgfWC16KjrASI+1p9GAroljyMHj6fK67i0UiTNvQ=="
+      "integrity": "sha512-PPlsspAZ4jbMBu5DMFhfUGDQLu/vrL4SyBROVS37x8ynnVmFIs1VPBz1Co8Xks3TvpIaZXmU85y4DrQ+UyVFoQ=="
     },
     "source-map": {
       "version": "0.6.1",
@@ -9303,9 +9384,9 @@
       "optional": true
     },
     "undici": {
-      "version": "8.3.0",
+      "version": "8.10.0",
-      "resolved": "https://registry.npmjs.org/undici/-/undici-8.3.0.tgz",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-8.10.0.tgz",
-      "integrity": "sha512-TkUDgb6tl7KOGZ+7e8E3d2FYgUQgF6z5YypqjWmixVQSQERFcVrVg0ySADm2LVLRh5ljAaHTCR5Fmz3Q34rB7Q=="
+      "integrity": "sha512-HvltHd7avK13QIw/oLe4qoOLyoVSoafqJ2jYOrtMRBkbYT31eiBQ8O0ehRKZiEZCMEyLFQNIADpgCWC5fALvYQ=="
     },
     "undici-types": {
       "version": "8.3.0",

package.json

@@ -5,6 +5,16 @@
   "type": "module",
   "description": "Set up your GitHub Actions workflow with a specific version of uv",
   "main": "dist/setup/index.cjs",
+  "engines": {
+    "npm": ">=11.10.0"
+  },
+  "devEngines": {
+    "packageManager": {
+      "name": "npm",
+      "version": ">=11.10.0",
+      "onFail": "error"
+    }
+  },
   "scripts": {
     "build": "tsc --noEmit",
     "check": "biome check --write",
@@ -12,7 +22,7 @@
     "test:unit": "node --experimental-vm-modules ./node_modules/jest/bin/jest.js",
     "test": "npm run build && npm run test:unit",
     "act": "act pull_request -W .github/workflows/test.yml --container-architecture linux/amd64 -s GITHUB_TOKEN=\"$(gh auth token)\"",
-    "update-known-checksums": "RUNNER_TEMP=known_versions node dist/update-known-checksums/index.cjs src/download/checksum/known-checksums.ts",
+    "update-known-checksums": "RUNNER_TEMP=known_versions node dist/update-known-checksums/index.cjs src/download/checksum/known-checksums.json",
     "all": "npm run build && npm run check && npm run package && npm run test:unit"
   },
   "repository": {
@@ -28,25 +38,25 @@
   "author": "@eifinger",
   "license": "MIT",
   "dependencies": {
-    "@actions/cache": "^6.1.0",
+    "@actions/cache": "^6.2.0",
     "@actions/core": "^3.0.0",
     "@actions/exec": "^3.0.0",
-    "@actions/glob": "^0.6.1",
+    "@actions/glob": "^0.7.0",
     "@actions/io": "^3.0.2",
     "@actions/tool-cache": "^4.0.0",
     "@renovatebot/pep440": "^5.0.0",
-    "smol-toml": "^1.7.0",
+    "smol-toml": "^1.7.1",
-    "undici": "^8.3.0"
+    "undici": "^8.10.0"
   },
   "devDependencies": {
-    "@biomejs/biome": "^2.5.1",
+    "@biomejs/biome": "^2.5.7",
     "@types/js-yaml": "^4.0.9",
-    "@types/node": "^26.1.1",
+    "@types/node": "^26.1.2",
-    "@types/semver": "^7.7.1",
+    "@types/semver": "^7.8.0",
     "@vercel/ncc": "^0.44.1",
     "esbuild": "^0.28.1",
     "jest": "^30.4.2",
-    "js-yaml": "^5.2.1",
+    "js-yaml": "^5.2.3",
     "ts-jest": "^29.4.11",
     "typescript": "^6.0.3"
   }

src/download/checksum/known-version.ts

@@ -0,0 +1,23 @@
+import * as semver from "semver";
+import { KNOWN_CHECKSUMS } from "./known-checksums";
+
+const VERSION_IN_CHECKSUM_KEY_PATTERN =
+  /-(\d+\.\d+\.\d+(?:[-+][0-9A-Za-z.-]+)?)$/;
+
+export function getLatestKnownVersion(): string {
+  const versions = new Set<string>();
+
+  for (const key of Object.keys(KNOWN_CHECKSUMS)) {
+    const version = key.match(VERSION_IN_CHECKSUM_KEY_PATTERN)?.[1];
+    if (version !== undefined) {
+      versions.add(version);
+    }
+  }
+
+  const latestVersion = [...versions].sort(semver.rcompare)[0];
+  if (!latestVersion) {
+    throw new Error("Could not determine latest known version from checksums.");
+  }
+
+  return latestVersion;
+}

src/download/checksum/update-known-checksums.ts

@@ -19,16 +19,7 @@ export async function updateChecksums(
     deduplicatedEntries.set(entry.key, entry.checksum);
   }
 
-  const body = [...deduplicatedEntries.entries()]
+  const content = `${JSON.stringify(Object.fromEntries(deduplicatedEntries), null, 2)}\n`;
-    .map(([key, checksum]) => `  "${key}":\n    "${checksum}"`)
-    .join(",\n");
-
-  const content =
-    "// AUTOGENERATED_DO_NOT_EDIT\n" +
-    "export const KNOWN_CHECKSUMS: { [key: string]: string } = {\n" +
-    body +
-    (body === "" ? "" : ",\n") +
-    "};\n";
 
   await fs.writeFile(filePath, content);
 }

src/download/manifest.ts

@@ -31,6 +31,7 @@ interface CachedManifest {
 }
 
 const cachedManifestData = new Map<string, CachedManifest>();
+export const MANIFEST_FETCH_ATTEMPTS = 3;
 
 export async function fetchManifest(
   manifestUrl: string = VERSIONS_MANIFEST_URL,
@@ -166,8 +167,26 @@ export function clearManifestCache(manifestUrl?: string): void {
 }
 
 async function fetchManifestResponse(manifestUrl: string) {
-  log.info(`Fetching manifest data from ${manifestUrl} ...`);
+  let response: Awaited<ReturnType<typeof fetch>> | undefined;
-  const response = await fetch(manifestUrl, {});
+  for (let attempt = 1; attempt <= MANIFEST_FETCH_ATTEMPTS; attempt++) {
+    log.info(`Fetching manifest data from ${manifestUrl} ...`);
+    try {
+      response = await fetch(manifestUrl, {});
+      break;
+    } catch (error) {
+      if (attempt >= MANIFEST_FETCH_ATTEMPTS) {
+        throw error;
+      }
+      const delayMs = 1_000 * 2 ** (attempt - 1);
+      log.info(`Manifest fetch failed; retrying in ${delayMs}ms ...`);
+      await new Promise((resolve) => setTimeout(resolve, delayMs));
+    }
+  }
+
+  if (response === undefined) {
+    throw new Error("Manifest fetch attempts exhausted.");
+  }
+
   if (!response.ok) {
     throw new Error(
       `Failed to fetch manifest data: ${response.status} ${response.statusText}`,

src/update-known-checksums.ts

@@ -1,6 +1,6 @@
 import * as core from "@actions/core";
 import * as semver from "semver";
-import { KNOWN_CHECKSUMS } from "./download/checksum/known-checksums";
+import { getLatestKnownVersion } from "./download/checksum/known-version";
 import {
   type ChecksumEntry,
   updateChecksums,
@@ -12,9 +12,6 @@ import {
 } from "./download/manifest";
 import * as log from "./utils/logging";
 
-const VERSION_IN_CHECKSUM_KEY_PATTERN =
-  /-(\d+\.\d+\.\d+(?:[-+][0-9A-Za-z.-]+)?)$/;
-
 async function run(): Promise<void> {
   const checksumFilePath = process.argv.slice(2)[0];
   if (!checksumFilePath) {
@@ -24,7 +21,7 @@ async function run(): Promise<void> {
   }
 
   const latestVersion = await getLatestVersion();
-  const latestKnownVersion = getLatestKnownVersionFromChecksums();
+  const latestKnownVersion = getLatestKnownVersion();
 
   if (semver.lte(latestVersion, latestKnownVersion)) {
     log.info(
@@ -40,28 +37,6 @@ async function run(): Promise<void> {
   core.setOutput("latest-version", latestVersion);
 }
 
-function getLatestKnownVersionFromChecksums(): string {
-  const versions = new Set<string>();
-
-  for (const key of Object.keys(KNOWN_CHECKSUMS)) {
-    const version = extractVersionFromChecksumKey(key);
-    if (version !== undefined) {
-      versions.add(version);
-    }
-  }
-
-  const latestVersion = [...versions].sort(semver.rcompare)[0];
-  if (!latestVersion) {
-    throw new Error("Could not determine latest known version from checksums.");
-  }
-
-  return latestVersion;
-}
-
-function extractVersionFromChecksumKey(key: string): string | undefined {
-  return key.match(VERSION_IN_CHECKSUM_KEY_PATTERN)?.[1];
-}
-
 function extractChecksumsFromManifest(
   versions: ManifestVersion[],
 ): ChecksumEntry[] {

src/utils/inputs.ts

@@ -1,5 +1,7 @@
+import fs from "node:fs";
 import path from "node:path";
 import * as core from "@actions/core";
+import { getPythonVersionFromToolVersions } from "../version/tool-versions-file";
 import { getConfigValueFromTomlFile } from "./config-file";
 import * as log from "./logging";
 
@@ -51,7 +53,7 @@ export function loadInputs(): SetupInputs {
   const workingDirectory = core.getInput("working-directory");
   const version = core.getInput("version");
   const versionFile = getVersionFile(workingDirectory);
-  const pythonVersion = core.getInput("python-version");
+  const pythonVersion = getPythonVersion(versionFile);
   const activateEnvironment = core.getBooleanInput("activate-environment");
   const noProject = core.getBooleanInput("no-project");
   const venvPath = getVenvPath(workingDirectory, activateEnvironment);
@@ -122,6 +124,28 @@ function getVersionFile(workingDirectory: string): string {
   return versionFileInput;
 }
 
+function getPythonVersion(versionFile: string): string {
+  const pythonVersionInput = core.getInput("python-version");
+  if (pythonVersionInput !== "") {
+    return pythonVersionInput;
+  }
+  if (process.env.UV_PYTHON !== undefined && process.env.UV_PYTHON !== "") {
+    return "";
+  }
+  if (versionFile === "" || !fs.existsSync(versionFile)) {
+    return "";
+  }
+
+  try {
+    return getPythonVersionFromToolVersions(versionFile) ?? "";
+  } catch (err) {
+    log.warning(
+      `Error while parsing Python version from ${versionFile}: ${(err as Error).message}`,
+    );
+    return "";
+  }
+}
+
 function getVenvPath(
   workingDirectory: string,
   activateEnvironment: boolean,
@@ -140,7 +164,27 @@ function getVenvPath(
 function getEnableCache(): boolean {
   const enableCacheInput = core.getInput("enable-cache");
   if (enableCacheInput === "auto") {
-    return process.env.RUNNER_ENVIRONMENT === "github-hosted";
+    if (process.env.RUNNER_ENVIRONMENT !== "github-hosted") {
+      return false;
+    }
+
+    const eventName = process.env.GITHUB_EVENT_NAME;
+    const isTagPush =
+      eventName === "push" && process.env.GITHUB_REF?.startsWith("refs/tags/");
+    if (isTagPush) {
+      log.info("Caching is disabled for tag pushes");
+      return false;
+    }
+    if (
+      eventName === "pull_request_target" ||
+      eventName === "workflow_run" ||
+      eventName === "release"
+    ) {
+      log.info(`Caching is disabled for the ${eventName} event`);
+      return false;
+    }
+
+    return true;
   }
   return enableCacheInput === "true";
 }

src/version/resolve.ts

@@ -2,6 +2,7 @@ import * as core from "@actions/core";
 import * as tc from "@actions/tool-cache";
 import * as pep440 from "@renovatebot/pep440";
 import * as semver from "semver";
+import { getLatestKnownVersion } from "../download/checksum/known-version";
 import {
   getAllVersions,
   getFirstMatchingVersion,
@@ -143,6 +144,10 @@ export async function resolveVersion(
 ): Promise<string> {
   core.debug(`Resolving version: ${versionInput}`);
 
+  if (versionInput.trim() === "latest-known") {
+    return getLatestKnownVersion();
+  }
+
   const context: ConcreteVersionResolutionContext = {
     manifestUrl,
     parsedSpecifier: parseVersionSpecifier(versionInput),

src/version/tool-versions-file.ts

@@ -4,28 +4,83 @@ import * as core from "@actions/core";
 export function getUvVersionFromToolVersions(
   filePath: string,
 ): string | undefined {
+  const versions = getToolVersions(filePath, "uv");
+  if (versions === undefined || versions.length !== 1) {
+    return undefined;
+  }
+
+  const version = stripVersionPrefix(versions[0]);
+  if (isPath(version)) {
+    core.warning(
+      `The uv version ${versions[0]} in .tool-versions is not supported. Paths are not allowed.`,
+    );
+    return undefined;
+  }
+  if (version.startsWith("ref")) {
+    core.warning(
+      "The ref syntax of .tool-versions is not supported. Please use a released version instead.",
+    );
+    return undefined;
+  }
+  return version;
+}
+
+export function getPythonVersionFromToolVersions(
+  filePath: string,
+): string | undefined {
+  const versions = getToolVersions(filePath, "python");
+  if (versions === undefined || versions.length === 0) {
+    return undefined;
+  }
+  if (versions.length > 1) {
+    core.warning(
+      "Multiple Python versions in .tool-versions are not supported. The Python entry will be ignored.",
+    );
+    return undefined;
+  }
+
+  const version = stripVersionPrefix(versions[0]);
+  if (
+    version === "system" ||
+    version.startsWith("ref:") ||
+    version.startsWith("path:") ||
+    isPath(version)
+  ) {
+    core.warning(
+      `The Python version ${versions[0]} in .tool-versions is not supported. The Python entry will be ignored.`,
+    );
+    return undefined;
+  }
+  return version;
+}
+
+function getToolVersions(
+  filePath: string,
+  toolName: string,
+): string[] | undefined {
   if (!filePath.endsWith(".tool-versions")) {
     return undefined;
   }
   const fileContents = fs.readFileSync(filePath, "utf8");
-  const lines = fileContents.split("\n");
 
-  for (const line of lines) {
+  for (const line of fileContents.split("\n")) {
-    // Skip commented lines
+    const content = line.split("#", 1)[0].trim();
-    if (line.trim().startsWith("#")) {
+    if (content === "") {
       continue;
     }
-    const match = line.match(/^\s*uv\s*v?\s*(?<version>[^\s]+)\s*$/);
+
-    if (match) {
+    const [tool, ...versions] = content.split(/\s+/);
-      const matchedVersion = match.groups?.version.trim();
+    if (tool === toolName) {
-      if (matchedVersion?.startsWith("ref")) {
+      return versions;
-        core.warning(
-          "The ref syntax of .tool-versions is not supported. Please use a released version instead.",
-        );
-        return undefined;
-      }
-      return matchedVersion;
     }
   }
   return undefined;
 }
+
+function stripVersionPrefix(version: string): string {
+  return version.startsWith("v") ? version.slice(1) : version;
+}
+
+function isPath(version: string): boolean {
+  return version.includes("/") || version.includes("\\");
+}

tsconfig.json

@@ -5,6 +5,7 @@
     "module": "esnext",
     "moduleResolution": "bundler",
     "noImplicitAny": true,
+    "resolveJsonModule": true,
     "strict": true,
     "target": "ES2022"
   },