diff --git a/sync.py b/sync.py
index 596cf63..838a6d7 100644
--- a/sync.py
+++ b/sync.py
@@ -1,7 +1,7 @@
 import asyncio
 import aiofiles
 import yaml
-from pydantic import BaseModel, field_validator
+from pydantic import BaseModel
 
 class Config(BaseModel):
     images: list["Images"] = []
@@ -39,6 +39,12 @@ async def docker_push(image: str) -> int | None:
     print(f"Pushing image {image}...")
     return await run_command(f"docker push {image}")
 
+semaphore = asyncio.Semaphore(5)
+
+async def limited_task(task):
+    async with semaphore:
+        return await task
+
 async def main():
     async with aiofiles.open('images.yaml', 'r') as file:
         config = await file.read()
@@ -57,20 +63,21 @@ async def main():
                     await docker_pull(f"{image.source}:{tag}")
                     await docker_tag(f"{image.source}:{tag}", f"{image.target}:{tag}")
                     await docker_push(f"{image.target}:{tag}")
-                tasks.append(task())
+                tasks.append(limited_task(task()))
         else:
             async def task():
                 await docker_pull(image.source)
                 await docker_tag(image.source, image.target)
                 await docker_push(image.target)
-            tasks.append(task())
+            tasks.append(limited_task(task()))
     
     results = await asyncio.gather(*tasks)
     failed_tasks = 0
     for result in results:
         if result is not None and result != 0:
             failed_tasks += 1
-    print(f"{len(results)} tasks completed. {len(result) - failed_tasks} succeed, {failed_tasks} failed.")
+            
+    print(f"{len(results)} tasks completed. {len(results) - failed_tasks} succeed, {failed_tasks} failed.")
 
 if __name__ == "__main__":
     asyncio.run(main())
\ No newline at end of file