diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6107e260..bc80c75c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -47,6 +47,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
+        with:
+          submodules: true
 
       - name: Install Crystal
         uses: crystal-lang/install-crystal@v1.6.0