diff --git a/.github/workflows/ccpp.yml b/.github/workflows/ccpp.yml
index 900c3402..9dcc9b3d 100644
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@@ -15,7 +15,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macOS-latest]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@master
     - name: build directory
       run: cmake -E make_directory ${{runner.workspace}}/build
     - name: configure