diff --git a/.github/workflows/push_pr.yml b/.github/workflows/push_pr.yml
index 7491d5d..0e85c55 100644
--- a/.github/workflows/push_pr.yml
+++ b/.github/workflows/push_pr.yml
@@ -38,6 +38,6 @@ jobs:
       - name: Run pytest
         shell: bash -l {0}
         run: |
-            conda install pytest h5py
+            conda install pytest h5py pillow
             pip install --no-deps .
             pytest -m "not orientation" tests