diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5203130..f2257ae 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -44,6 +44,7 @@ jobs:
 
     - name: Run tests
       run: |
+        source venv/bin/activate
         python -m pytest -rsx tests/test_json.py --data-path=/home/runner/work/fair-mast/fair-mast/tests/mock_data/mini