diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
index 5f47dc8f..da54e590 100644
--- a/.github/workflows/python.yml
+++ b/.github/workflows/python.yml
@@ -36,6 +36,9 @@ jobs:
         # last upstream patch releases with installers.
         # https://github.com/actions/setup-python/issues/439#issuecomment-1247646682
         include:
+          - os: ubuntu-latest
+            python-version: "3.12"
+            sdist: sdist
           - os: macos-latest
             python-version: "3.9"
             upstream-python: 3.9.13
@@ -75,7 +78,10 @@ jobs:
         esac
     - name: Build wheel
       run: |
-        python -m build -w
+        if [ -z "${{ matrix.sdist }}" ]; then
+            wheel_only=-w
+        fi
+        python -m build $wheel_only
         case "${{ matrix.os }}" in
         ubuntu-*)
             mkdir old