diff --git a/.github/workflows/sphinx.yml b/.github/workflows/sphinx.yml
index 6a30283..e7472b2 100644
--- a/.github/workflows/sphinx.yml
+++ b/.github/workflows/sphinx.yml
@@ -22,6 +22,8 @@ jobs:
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - uses: actions/checkout@v3
+        with:
+          submodules: true
       - name: Install Doxygen
         run: sudo apt-get update -y && sudo apt-get install -y doxygen
       - name: Install Python Dependencies