diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index dc1b872..36fa223 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -13,6 +13,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+      with:
+        submodules: true
 
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1