diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 68378723d..ff5ba6c9d 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -27,6 +27,6 @@ jobs:
           pip install .
       - name: Build package
         run: |
-          python -m build
+          python -m build --sdist
       - name: Publish package distributions to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1