diff --git a/.github/workflows/AppFwkUnitTest.yml b/.github/workflows/AppFwkUnitTest.yml
index a51c963d21..b9017691d9 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@v4
+        uses: actions/checkout@v5
 
       - 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 4020e565c0..276d173aa1 100644
--- a/.github/workflows/ResInsightWithCache.yml
+++ b/.github/workflows/ResInsightWithCache.yml
@@ -70,7 +70,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           submodules: true
 
diff --git a/.github/workflows/centos7.yml b/.github/workflows/centos7.yml
index 17def04c69..76f2d51550 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@v4
+        uses: actions/checkout@v5
         with:
           submodules: true
       - name: Set up Python
diff --git a/.github/workflows/clang-format.yml b/.github/workflows/clang-format.yml
index 7f9f4daf86..52a358c7f1 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@v4
+      - uses: actions/checkout@v5
       - name: Check format - ApplicationLibCode
         run: |
           cd ApplicationLibCode
diff --git a/.github/workflows/clang-tidy.yml b/.github/workflows/clang-tidy.yml
index e6085a2f42..fd1d1baa63 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@v4
+        uses: actions/checkout@v5
         with:
           submodules: true
 
diff --git a/.github/workflows/cmake-format.yml b/.github/workflows/cmake-format.yml
index beae6c3ec1..4f7aa3bdaa 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@v4
+      - uses: actions/checkout@v5
       - 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 af0eeea882..4adf7d02b4 100644
--- a/.github/workflows/delete_artifacts.yml
+++ b/.github/workflows/delete_artifacts.yml
@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: setup python
         uses: actions/setup-python@v5
         with:
diff --git a/.github/workflows/python-linting.yml b/.github/workflows/python-linting.yml
index 41c801626c..04f955ec3c 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@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-python@v5
         with:
           python-version: '3.10' 
diff --git a/.github/workflows/spell-check.yml b/.github/workflows/spell-check.yml
index dfb7344092..8dad80119e 100644
--- a/.github/workflows/spell-check.yml
+++ b/.github/workflows/spell-check.yml
@@ -7,7 +7,7 @@ jobs:
   build:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: sobolevn/misspell-fixer-action@master
         with:
           options: "-rsvnuR ApplicationLibCode/"
diff --git a/.github/workflows/update-submodules.yml b/.github/workflows/update-submodules.yml
index b966c3c328..ec40e6f936 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@v4
+        uses: actions/checkout@v5
         with:
           submodules: recursive