diff --git a/.github/workflows/build_wheels.yml b/.github/workflows/build_wheels.yml
index 8a44bbc..0bca470 100644
--- a/.github/workflows/build_wheels.yml
+++ b/.github/workflows/build_wheels.yml
@@ -9,6 +9,10 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
     steps:
       - uses: actions/checkout@v2
+      - name: Checkout submodules
+        uses: textbook/git-checkout-submodule-action@master
+        with:
+          remote: true
 
       - uses: actions/setup-python@v2
         with: