diff --git a/.github/workflows/AppFwkUnitTest.yml b/.github/workflows/AppFwkUnitTest.yml
index b9017691d9..15b92c5798 100644
--- a/.github/workflows/AppFwkUnitTest.yml
+++ b/.github/workflows/AppFwkUnitTest.yml
@@ -14,7 +14,7 @@ jobs:
             build_flags: -DCEE_USE_QT6=ON -DCEE_USE_QT5=OFF
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set apt mirror
         # see https://github.com/actions/runner-images/issues/7048
diff --git a/.github/workflows/ResInsightWithCache.yml b/.github/workflows/ResInsightWithCache.yml
index 128afdc621..ef574bca6e 100644
--- a/.github/workflows/ResInsightWithCache.yml
+++ b/.github/workflows/ResInsightWithCache.yml
@@ -70,7 +70,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: true
 
diff --git a/.github/workflows/centos7.yml b/.github/workflows/centos7.yml
index 839a39763d..b6990bfc4f 100644
--- a/.github/workflows/centos7.yml
+++ b/.github/workflows/centos7.yml
@@ -44,7 +44,7 @@ jobs:
           make -j 4
           make install
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: true
       - name: Set up Python
diff --git a/.github/workflows/clang-format.yml b/.github/workflows/clang-format.yml
index 52a358c7f1..9cd650b45a 100644
--- a/.github/workflows/clang-format.yml
+++ b/.github/workflows/clang-format.yml
@@ -20,7 +20,7 @@ jobs:
           sudo apt-get update
           sudo apt-get install --option="APT::Acquire::Retries=3" clang-format-19
           clang-format-19 --version
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Check format - ApplicationLibCode
         run: |
           cd ApplicationLibCode
diff --git a/.github/workflows/clang-tidy.yml b/.github/workflows/clang-tidy.yml
index 12c91071ef..1c8517f25c 100644
--- a/.github/workflows/clang-tidy.yml
+++ b/.github/workflows/clang-tidy.yml
@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: true
 
diff --git a/.github/workflows/cmake-format.yml b/.github/workflows/cmake-format.yml
index 4f7aa3bdaa..f9f0d34e1c 100644
--- a/.github/workflows/cmake-format.yml
+++ b/.github/workflows/cmake-format.yml
@@ -9,7 +9,7 @@ jobs:
       - name: Install cmakelang for cmake-format
         run: |
           python3 -m pip install --user cmakelang
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Check format - ApplicationLibCode
         run: |
           ~/.local/bin/cmake-format -c ${{ github.workspace }}/cmake/cmake-format.py -i CMakeLists.txt
diff --git a/.github/workflows/delete_artifacts.yml b/.github/workflows/delete_artifacts.yml
index c41afdef3b..61bf26f6fc 100644
--- a/.github/workflows/delete_artifacts.yml
+++ b/.github/workflows/delete_artifacts.yml
@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: setup python
         uses: actions/setup-python@v6
         with:
diff --git a/.github/workflows/python-linting.yml b/.github/workflows/python-linting.yml
index 67d1f6f7ab..0e6d1a71db 100644
--- a/.github/workflows/python-linting.yml
+++ b/.github/workflows/python-linting.yml
@@ -6,7 +6,7 @@ jobs:
   lint:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v6
         with:
           python-version: '3.10' 
diff --git a/.github/workflows/spell-check-pr.yml b/.github/workflows/spell-check-pr.yml
index dcaab64fa5..7a47bc912b 100644
--- a/.github/workflows/spell-check-pr.yml
+++ b/.github/workflows/spell-check-pr.yml
@@ -15,7 +15,7 @@ jobs:
   spell-check:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       
diff --git a/.github/workflows/spell-check.yml b/.github/workflows/spell-check.yml
index be296ce74d..a2cff6a856 100644
--- a/.github/workflows/spell-check.yml
+++ b/.github/workflows/spell-check.yml
@@ -13,7 +13,7 @@ jobs:
   build:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       
       - name: Set up Python
         uses: actions/setup-python@v6
diff --git a/.github/workflows/update-submodules.yml b/.github/workflows/update-submodules.yml
index ec40e6f936..640e03fbf0 100644
--- a/.github/workflows/update-submodules.yml
+++ b/.github/workflows/update-submodules.yml
@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive