diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 00dc33f45..3b31a4b4b 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -57,6 +57,9 @@ jobs:
         if [ ${{ matrix.conda-env }} == 'full' ] && [ ${{ matrix.python-version }} == '3.12' ]; then
           sed -i '/- pyfftw/d' dependencies_${{ matrix.conda-env }}.yml
         fi
+        if [ ${{ matrix.conda-env }} == 'full' ] && [ ${{ matrix.python-version }} == '3.9' ]; then
+          sed -i '/- mpi4py/d' dependencies_${{ matrix.conda-env }}.yml
+        fi
         conda env update --file dependencies_${{ matrix.conda-env }}.yml --name base
         conda install --solver=classic flake8 pytest pytest-cov
         conda list