diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index da29abd..b0cf3f2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,5 +22,5 @@ jobs:
           restore-keys: |
             mkdocs-material-
       - run: pip install mkdocs-material
-      - run: pip install pillow cairosvg
+      - run: pip install pillow cairosvg glightbox
       - run: mkdocs gh-deploy --force