diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index cd2b366f0..08c3429da 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -12,6 +12,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+      with:
+        submodules: true
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v1
       with: