diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 19199a6..7b79040 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -26,6 +26,8 @@ jobs:
     name: macOS
     steps:
     - uses: actions/checkout@master
+    - name: Checkout submodules
+      uses: textbook/git-checkout-submodule-action@master
     - name: Select Xcode version
       run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app; swift -version
     - name: Get Swift Version
@@ -72,6 +74,8 @@ jobs:
         echo "::set-output name=version::$(swift -version | head -n 1 | sed s/,// )"
       shell: bash
     - uses: actions/checkout@master
+    - name: Checkout submodules
+      uses: textbook/git-checkout-submodule-action@master
     - name: Cache resolved dependencies
       id: cache-resolved-dependencies
       uses: actions/cache@v2