diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 83c3724..d799102 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -39,5 +39,6 @@ jobs:
         run: go test -v -covermode=count -coverprofile=coverage.out ./...
       - name: upload coverage
         uses: shogo82148/actions-goveralls@v1
+        if: github.ref == 'refs/heads/main' && github.event_name == 'push' && matrix.go-version == '1.21.x'
         with:
           path-to-profile: coverage.out