diff --git a/.github/workflows/unix_unit_tests.yml b/.github/workflows/unix_unit_tests.yml
index 1e6ff5330..9ebd241f9 100644
--- a/.github/workflows/unix_unit_tests.yml
+++ b/.github/workflows/unix_unit_tests.yml
@@ -43,12 +43,9 @@
         - name: Install Python  dependencies
           shell: bash -el {0}
           run: |
+            python -m pip install --upgrade pip
             if [ ${{ matrix.os }} == 'macos-latest' ]; then
-              python -m pip install --upgrade pip
-              conda install --yes -c conda-forge mpi4py openmpi
-            elif [[ "${{ matrix.os }}" == "ubuntu-latest" ]]; then 
-              python -m pip install --upgrade pip
-              python -m pip install mpi4py
+              conda install --yes -c conda-forge openmpi
             fi
         - name: Install HNN-core
           shell: bash -el {0}