diff --git a/.github/workflows/pr-check.yml b/.github/workflows/pr-check.yml
index 1e439700..7e6d85da 100644
--- a/.github/workflows/pr-check.yml
+++ b/.github/workflows/pr-check.yml
@@ -20,6 +20,7 @@ jobs:
       - name: Setup python modules
         run: |
           pip3 install requests
+          pip3 install pillow
 
       - name: Rebuild all themes
         run: |