diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index a72ec7a..f2c3114 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -30,7 +30,7 @@ jobs:
 
     steps:
       - name: Check out Git repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set PHP_COVERAGE
         run: |