diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index e201b627..ed6a52bb 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -72,7 +72,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install mpi4py pytest pytest-mpi fortranformat anesthetic
+        python -m pip install mpi4py pytest fortranformat anesthetic
 
     - name: Install pypolychord
       run: pip install -v '.[test]'
@@ -81,4 +81,4 @@ jobs:
       run: python -m pytest tests
 
     - name: Test pypolychord (MPI)
-      run: mpirun --oversubscribe -np 3 python -m pytest tests --only-mpi 
+      run: mpirun --oversubscribe -np 3 python -m pytest tests