diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1fbd304..5ec76be 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,7 +27,7 @@ jobs:
         run: composer validate
 
       - name: Install Composer dependencies
-        uses: "ramsey/composer-install@v2"
+        uses: "ramsey/composer-install@4.0.0"
 
       - name: PHP coding standards
         run: composer phpcs