diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index f96d7c1f..bb3f943d 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -10,7 +10,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@main
-
+        with:
+          submodules: 'recursive'
       - uses: ocaml/setup-ocaml@v3
         with:
           ocaml-compiler: '5.2'
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6ee99513..cce2c037 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -15,6 +15,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@main
+      with:
+        submodules: 'recursive'
     - uses: ocaml/setup-ocaml@v3
       with:
         ocaml-compiler: ${{ matrix.ocaml-compiler }}
@@ -44,6 +46,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@main
+      with:
+          submodules: 'recursive'
     - uses: ocaml/setup-ocaml@v3
       with:
         ocaml-compiler: ${{ matrix.ocaml-compiler }}