diff --git a/.github/workflows/pandora2d_ci.yml b/.github/workflows/pandora2d_ci.yml
index 026bc86..a42d89e 100644
--- a/.github/workflows/pandora2d_ci.yml
+++ b/.github/workflows/pandora2d_ci.yml
@@ -22,6 +22,7 @@ jobs:
         python -m pip install --upgrade pip
         pip install pytest
         pip install pytest-cov
+        pip install pytest-mock
         pip install codecov
         pip install build
     - name: Install Pandora2d