diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 54e46ff..6ae5d8e 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -19,6 +19,7 @@ jobs:
           python-version: "3.11"
       - name: build release distributions
         run: |
+          python -m pip install build
           python -m build --sdist --wheel --outdir dist/ .
       - name: upload wheel and tarball
         uses: actions/upload-artifact@v4
@@ -40,4 +41,5 @@ jobs:
           name: release-dists
           path: dist/
       - name: Publish release distributions to PyPI
+        if: startsWith(github.ref, 'refs/tags')
         uses: pypa/gh-action-pypi-publish@release/v1