diff --git a/.github/workflows/ccpp_mac.yml b/.github/workflows/ccpp_mac.yml
index f85966777..34b776b92 100644
--- a/.github/workflows/ccpp_mac.yml
+++ b/.github/workflows/ccpp_mac.yml
@@ -11,7 +11,9 @@ jobs:
     runs-on: macos-latest
     
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
+      with:
+        ref: 'CI'
     - name: change date in version
       run: |
         sed "s/+UNKNOWN/_$(date '+%F')/" version.inc > version.date.inc
diff --git a/.github/workflows/ccpp_ubuntu.yml b/.github/workflows/ccpp_ubuntu.yml
index 16eb54ca2..af6328c51 100644
--- a/.github/workflows/ccpp_ubuntu.yml
+++ b/.github/workflows/ccpp_ubuntu.yml
@@ -11,7 +11,9 @@ jobs:
     runs-on: ubuntu-latest
     
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
+      with:
+        ref: 'CI'
     - name: change date in version
       run: sed -i "s/+UNKNOWN/_$(date '+%F')/" version.inc
     - name: update clock
diff --git a/.github/workflows/ccpp_win.yml b/.github/workflows/ccpp_win.yml
index dec654b4a..42d574f2d 100644
--- a/.github/workflows/ccpp_win.yml
+++ b/.github/workflows/ccpp_win.yml
@@ -10,7 +10,9 @@ jobs:
     runs-on: windows-latest
     
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
+      with:
+        ref: 'CI'
     - uses: ilammy/msvc-dev-cmd@v1
     - name: mkdir in deps
       run: mkdir deps/build