try again 4

Author: Jeffrey Whitaker

.github/workflows/build_latest.yml

@@ -63,7 +63,7 @@ jobs:
     - name: Install python dependencies via pip
       run: |
         python -m pip install --upgrade pip
-        python -m pip install numpy cython cftime pytest twine wheel check-manifest typing-extensions
+        python -m pip install numpy cython cftime pytest twine wheel check-manifest mpi4py typing-extensions
 
     - name: Install netcdf4-python
       run: |