diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 3642109..df70a3c 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -15,6 +15,8 @@ jobs:
           python3-venv
 
     - uses: actions/checkout@v3
+      with:
+        submodules: 'true'
 
     - name: pip install
       run: |