diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index 0f50937a88b..f4847bebab6 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -51,6 +51,7 @@ jobs:
             kastrup
             spath3
             xpatch
+            forest
 
       - name: Check `latex` version
         run: latex --version