diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3cfcba74..4dde8e9a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -65,6 +65,9 @@ jobs:
     - name: Validate composer.json and composer.lock
       run: composer validate
 
+    - name: Install dependencies
+      run: composer install
+
     - name: Cache Composer packages
       id: composer-cache
       uses: actions/cache@v2