diff --git a/.github/workflows/A-test-master.yml b/.github/workflows/A-test-master.yml
index ac62cdb..ac8523a 100644
--- a/.github/workflows/A-test-master.yml
+++ b/.github/workflows/A-test-master.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       
     - name: Set up JDK 1.8
       uses: actions/setup-java@v3