diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 803adcaa..3ad9d492 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -84,7 +84,7 @@ jobs:
       run: sudo apt-get install python3-pip python3-dev python3-setuptools python3-pil libfuse2
 
     - name: Install OpenSCAD-DocsGen package.
-      run: sudo pip3 install openscad-docsgen
+      run: sudo pip3 install openscad-docsgen imageio
 
     - name: Install OpenSCAD
       run: |