diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index bf51abe..d6446ad 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -42,6 +42,8 @@ jobs:
     runs-on: ${{ matrix.os }}-latest
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: recursive
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
@@ -52,7 +54,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           python -m pip install pytest
-          pip install .
+          pip install .[testing]
 
       - name: Test with pytest
         run: |