diff --git a/.github/workflows/pypipublish.yaml b/.github/workflows/pypipublish.yaml
index 8703473..abf36b9 100644
--- a/.github/workflows/pypipublish.yaml
+++ b/.github/workflows/pypipublish.yaml
@@ -1,26 +1,85 @@
-name: Upload Python Package
-
+name: Build distribution
 on:
   release:
-    types: [created]
+    types:
+      - published
+  push:
 
 jobs:
-  deploy:
+  build-artifacts:
     runs-on: ubuntu-latest
+    if: github.repository == 'carbonplan/xarray-schema'
     steps:
-      - uses: actions/checkout@v3
-      - name: Set up Python
-        uses: actions/setup-python@v3.1.0
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-python@v3
+        name: Install Python
         with:
-          python-version: "3.x"
+          python-version: 3.9
+
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          python -m pip install setuptools setuptools-scm wheel twine
-      - name: Build and publish
-        env:
-          TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
-          TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
+          python -m pip install setuptools setuptools-scm wheel twine check-manifest
+
+      - name: Build tarball and wheels
+        run: |
+          git clean -xdf
+          git restore -SW .
+          python -m build --sdist --wheel .
+
+      - name: Check built artifacts
         run: |
-          python setup.py sdist bdist_wheel
-          twine upload dist/*
+          python -m twine check dist/*
+          pwd
+          if [ -f dist/xarray-schema-unknown.tar.gz ]; then
+            echo "❌ INVALID VERSION NUMBER"
+            exit 1
+          else
+            echo "✅ Looks good"
+          fi
+      - uses: actions/upload-artifact@v2
+        with:
+          name: releases
+          path: dist
+
+  test-built-dist:
+    needs: build-artifacts
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-python@v3
+        name: Install Python
+        with:
+          python-version: 3.9
+      - uses: actions/download-artifact@v2
+        with:
+          name: releases
+          path: dist
+      - name: List contents of built dist
+        run: |
+          ls -ltrh
+          ls -ltrh dist
+
+      - name: Verify the built dist/wheel is valid
+        if: github.event_name == 'push'
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install dist/xarray_schema*.whl
+          python -c "import xarray_schema; print(xarray_schema.__version__)"
+
+  upload-to-pypi:
+    needs: test-built-dist
+    if: github.event_name == 'release'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/download-artifact@v2
+        with:
+          name: releases
+          path: dist
+      - name: Publish package to PyPI
+        uses: pypa/gh-action-pypi-publish@v1.5.0
+        with:
+          user: __token__
+          password: ${{ secrets.PYPI_TOKEN }}
+          verbose: true
diff --git a/requirements.txt b/requirements.txt
index 3215cff..36846b8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
 xarray>=0.16
-numpy>=1.20
+numpy>=1.21
diff --git a/xarray_schema/types.py b/xarray_schema/types.py
index d2bacb7..bd76b89 100644
--- a/xarray_schema/types.py
+++ b/xarray_schema/types.py
@@ -1,8 +1,7 @@
 from typing import Dict, Tuple, Union
 
-import numpy as np
+from numpy.typing import DTypeLike  # noqa: F401
 
-DTypeLike = np.typing.DTypeLike
 DimsT = Tuple[Union[str, None]]
 ShapeT = Tuple[Union[int, None]]
 ChunksT = Union[bool, Dict[str, Union[int, None]]]