diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a82870a..eebdcfd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,6 +24,8 @@ jobs:
           release: "9-2020-q2"
 
       - uses: actions/checkout@v3
+        with:
+          submodules: true
 
       - name: Check
         run: |