diff --git a/.github/workflows/test-ci.yml b/.github/workflows/test-ci.yml
index 1205cc995..0f3779061 100644
--- a/.github/workflows/test-ci.yml
+++ b/.github/workflows/test-ci.yml
@@ -91,7 +91,7 @@ jobs:
           path: ./output/coverage.tar
 
       - name: Upload to build.ethers.org
-        uses: ethers-io/sync-s3-action
+        uses: ethers-io/sync-s3-action@master
         with:
           aws_access_key_id: ${{ secrets.BUILD_AWS_ACCESS_KEY_ID }}
           aws_secret_access_key: ${{ secrets.BUILD_AWS_SECRET_ACCESS_KEY}}