diff --git a/.github/workflows/unittests.yml b/.github/workflows/unittests.yml
index 3cf5358..ec1ce60 100644
--- a/.github/workflows/unittests.yml
+++ b/.github/workflows/unittests.yml
@@ -13,6 +13,8 @@ jobs:
         os: [ubuntu-latest]
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: 'recursive'
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
         with: