diff --git a/.github/workflows/action_on_pull_request.yml b/.github/workflows/action_on_pull_request.yml
index 4f1ef645f..5859adc62 100644
--- a/.github/workflows/action_on_pull_request.yml
+++ b/.github/workflows/action_on_pull_request.yml
@@ -15,7 +15,7 @@ jobs:
       image: hkershaw/dart-dep:2.0
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Set checked out repo as a safe git directory
         run: git config --global --add safe.directory /__w/${{ github.event.repository.name }}/${{ github.event.repository.name }}
       - name: Build and run lorenz_96 with mpi
@@ -33,7 +33,7 @@ jobs:
       image: hkershaw/dart-dep:2.0
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Set checked out repo as a safe git directory
         run: git config --global --add safe.directory /__w/${{ github.event.repository.name }}/${{ github.event.repository.name }}
       - name: Build and run lorenz_63 with no mpi
@@ -50,7 +50,7 @@ jobs:
       image: hkershaw/dart-dep:2.0
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Set checked out repo as a safe git directory
         run: git config --global --add safe.directory /__w/${{ github.event.repository.name }}/${{ github.event.repository.name }}
       - name: Build and run lorenz_96 with mpif08
diff --git a/.github/workflows/cirrus_action_on_pull_request.yml b/.github/workflows/cirrus_action_on_pull_request.yml
index 0cc0d2155..528fe2a36 100644
--- a/.github/workflows/cirrus_action_on_pull_request.yml
+++ b/.github/workflows/cirrus_action_on_pull_request.yml
@@ -47,7 +47,7 @@ jobs:
 
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set checked out repo as a safe git directory
         run: git config --global --add safe.directory /__w/${{ github.event.repository.name }}/${{ github.event.repository.name }}
diff --git a/.github/workflows/pytools-tests.yml b/.github/workflows/pytools-tests.yml
index d0bfadc5b..00aafab69 100644
--- a/.github/workflows/pytools-tests.yml
+++ b/.github/workflows/pytools-tests.yml
@@ -16,7 +16,7 @@ jobs:
         python-version: ["3.10", "3.14"]
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
diff --git a/.github/workflows/run_all_quickbuilds.yml b/.github/workflows/run_all_quickbuilds.yml
index 90769cfb0..83b15cfa8 100644
--- a/.github/workflows/run_all_quickbuilds.yml
+++ b/.github/workflows/run_all_quickbuilds.yml
@@ -10,7 +10,7 @@ jobs:
     outputs:
       matrix: ${{ steps.matrix.outputs.value }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - id: matrix
         run: |
           git config --global --add safe.directory /__w/${{ github.event.repository.name }}/${{ github.event.repository.name }}
@@ -49,7 +49,7 @@ jobs:
         value: ${{fromJSON(needs.setup.outputs.matrix)}}
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Set checked out repo as a safe git directory
         run: git config --global --add safe.directory /__w/${{ github.event.repository.name }}/${{ github.event.repository.name }}
       - name: Creating Makefile template