diff --git a/.github/workflows/sync-files.yaml b/.github/workflows/sync-files.yaml
index 32f4613f6de7a..5dfe195c06537 100644
--- a/.github/workflows/sync-files.yaml
+++ b/.github/workflows/sync-files.yaml
@@ -20,3 +20,4 @@ jobs:
         uses: autowarefoundation/autoware-github-actions/sync-files@v1
         with:
           token: ${{ steps.generate-token.outputs.token }}
+          auto-merge-method: squash