diff --git a/.github/workflows/pypi.yaml b/.github/workflows/pypi.yaml
index 888540e..aa6abe6 100644
--- a/.github/workflows/pypi.yaml
+++ b/.github/workflows/pypi.yaml
@@ -8,6 +8,7 @@ jobs:
   tests:
     uses: ./.github/workflows/test.yaml
   pypi-publish:
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
     name: Upload release to PyPI
     needs: [tests] # require tests to pass before deploy runs
     runs-on: ubuntu-latest