diff --git a/.github/workflows/ci_build.yaml b/.github/workflows/ci_build.yaml
index 6f87fabc..b3f09a4b 100644
--- a/.github/workflows/ci_build.yaml
+++ b/.github/workflows/ci_build.yaml
@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: repo checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: check
         run: |
           .github/scripts/check_projects.sh theories
@@ -34,7 +34,7 @@ jobs:
         id: cpu-cores
 
       - name: repo checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         
       - name: Initialise variables
         run: |
diff --git a/.github/workflows/docker.yaml b/.github/workflows/docker.yaml
index bbd82a63..c843a3f8 100644
--- a/.github/workflows/docker.yaml
+++ b/.github/workflows/docker.yaml
@@ -16,7 +16,7 @@ jobs:
       id-token: write
     steps:
     - name: repo checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: container registry log in
       uses: docker/login-action@v3