diff --git a/.github/workflows/phpdoc.yml b/.github/workflows/phpdoc.yml
index fa81e14..8a973bf 100644
--- a/.github/workflows/phpdoc.yml
+++ b/.github/workflows/phpdoc.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0