diff --git a/.github/workflows/all.yml b/.github/workflows/all.yml
index 5c51cae..cdd5285 100644
--- a/.github/workflows/all.yml
+++ b/.github/workflows/all.yml
@@ -244,11 +244,40 @@ jobs:
              asv machine --yes
              asv continuous --sort name --no-only-changed refs/remotes/origin/main ${{ github.sha }} | tee >(sed '1,/All benchmarks:/d' > $GITHUB_STEP_SUMMARY)
 
+  build-python-sdist:
+    needs: [run-python-tests, run-python-tests-with-address-sanitizer]
+    continue-on-error: false
+    runs-on: 'ubuntu-latest'
+    if: true
+    name: Build Python source distribution
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: recursive
+      - uses: actions/setup-python@v3
+        with:
+          python-version: "3.10"
+      - name: Copy README into place
+        run: cp README.md python/
+      - name: Copy C++ code into place
+        run: rm -rfv python/src/cpp && cp -r cpp python/src
+        if: runner.os == 'Linux'
+      - name: Install build module
+        run: python -m pip install build
+      - name: Build source distribution
+        working-directory: python
+        run: python -m build --sdist --outdir ../dist
+      - uses: actions/upload-artifact@v4
+        with:
+          if-no-files-found: error
+          name: python-sdist
+          path: ./dist/*.tar.gz
+
   build-python-wheels:
     needs: [run-python-tests, run-python-tests-with-address-sanitizer]
     runs-on: ${{ matrix.os }}
     continue-on-error: false
-    if: true # (github.event_name == 'release' && github.event.action == 'published') || contains(github.event.pull_request.labels.*.name, 'Also Test Wheels')
+    if: true
     strategy:
       matrix:
         include:
@@ -420,15 +449,19 @@ jobs:
     defaults:
       run:
         working-directory: python
-    needs: [build-python-wheels, run-python-tests-with-address-sanitizer, run-python-tests]
+    needs: [build-python-wheels, build-python-sdist, run-python-tests-with-address-sanitizer, run-python-tests]
     runs-on: 'ubuntu-latest'
-    name: "Upload wheels to PyPI"
+    name: "Upload wheels and sdist to PyPI"
     if: github.event_name == 'release' && github.event.action == 'published'
     steps:
       - uses: actions/download-artifact@v4
         with:
           name: python-wheels
           path: dist
+      - uses: actions/download-artifact@v4
+        with:
+          name: python-sdist
+          path: dist
       - uses: pypa/gh-action-pypi-publish@v1.4.2
         with:
           user: __token__