diff --git a/.github/workflows/ci-osx.yaml b/.github/workflows/ci-osx.yaml
index 545d5412..d72f8643 100644
--- a/.github/workflows/ci-osx.yaml
+++ b/.github/workflows/ci-osx.yaml
@@ -20,7 +20,7 @@ jobs:
         uses: actions/setup-python@v1
         with:
           python-version: ${{ matrix.python-version }}
-      
+
       - name: Install numcodecs
         run: |
           python -m pip install -U pip setuptools wheel pytest
diff --git a/.github/workflows/wheel.yaml b/.github/workflows/wheel.yaml
index cc133fc4..123258e5 100644
--- a/.github/workflows/wheel.yaml
+++ b/.github/workflows/wheel.yaml
@@ -42,7 +42,9 @@ jobs:
     name: Build source distribution
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v1
+        with:
+          submodules: true
 
       - uses: actions/setup-python@v2
         name: Install Python
@@ -52,19 +54,44 @@ jobs:
       - name: Build sdist
         run: python setup.py sdist
 
+      - name: test install
+        run: pip install dist/numcodecs*.tar.gz
+
       - uses: actions/upload-artifact@v2
         with:
           path: dist/*.tar.gz
 
+  test_dist_pypi:
+    needs: [build_wheels, build_sdist]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/download-artifact@v1
+        with:
+          name: artifact
+          path: dist
+      - uses: actions/download-artifact@v1
+        with:
+          name: wheels
+          path: dist
+
+      - name: test
+        run: |
+          ls
+          ls dist
+
   upload_pypi:
     needs: [build_wheels, build_sdist]
     runs-on: ubuntu-latest
     if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags/v')
     steps:
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v1
         with:
           name: artifact
           path: dist
+      - uses: actions/download-artifact@v1
+        with:
+          name: wheels
+          path: dist
 
       - uses: pypa/gh-action-pypi-publish@master
         with: