diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 43ab242..9f7df74 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -13,6 +13,10 @@ jobs:
         python-version: ["3.9", "3.10", "3.11"]
     steps:
     - uses: actions/checkout@v3
+    - name: Checkout repository
+      uses: actions/checkout@master
+    - name: Checkout submodules
+      uses: textbook/git-checkout-submodule-action@master
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v3
       with: