diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index 8a20996..462ec1f 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -33,7 +33,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Get Composer cache directory
         id: composer-cache