diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3349f60..910c7b7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,6 +7,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
+        with:
+          submodules: true
 
       - name: Build image
         run: docker-compose build