diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 78b64b4..ac191da 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -28,7 +28,7 @@ jobs:
       - name: Install environment
         run: poetry install
       - name: Build release
-        run: poetry run python -m build --wheel --outdir dist
+        run: poetry run python -m build --wheel --sdist --outdir dist
       - name: Check that tag version and Poetry version match
         run: '[[ "v$(poetry version --short)" == "${{ github.ref_name }}" ]]'
       - name: Upload distribution to PyPI