diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index f4c6416..cabd94b 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -13,6 +13,8 @@ jobs:
     steps:
     - name: Checkout repository
       uses: actions/checkout@v2
+      with:
+        submodules: 'recursive'
 
     - name: Get latest package lists
       run: |