diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 0a8c645f..dea56824 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -150,6 +150,7 @@ jobs:
       id: cpu-cores
     - name: Clean dotnet folder for space
       run: rm -Rf /usr/share/dotnet
+    - run: python -m pip install pillow tifffile
     - name: Planemo test
       uses: galaxyproject/planemo-ci-action@v1
       id: test
diff --git a/.github/workflows/pr.yaml b/.github/workflows/pr.yaml
index bf006b98..c835b465 100644
--- a/.github/workflows/pr.yaml
+++ b/.github/workflows/pr.yaml
@@ -293,6 +293,7 @@ jobs:
       id: cpu-cores
     - name: Clean dotnet folder for space
       run: rm -Rf /usr/share/dotnet
+    - run: python -m pip install pillow tifffile
     - name: Planemo test
       uses: galaxyproject/planemo-ci-action@v1
       id: test