diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index b22afbb5..9b476eda 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -11,6 +11,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@main
+        with:
+          submodules: recursive
 
       - name: Use OCaml
         uses: ocaml/setup-ocaml@v2