diff --git a/.github/workflows/Line_Endings.yml b/.github/workflows/Line_Endings.yml
index 383d1d3cbc..294115df59 100644
--- a/.github/workflows/Line_Endings.yml
+++ b/.github/workflows/Line_Endings.yml
@@ -21,7 +21,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Check for CRLF line endings
         run: |
diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index 696d1da6f0..b133a1e200 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -94,7 +94,7 @@ jobs:
         sudo apt-get -y update
         sudo apt-get -y install libopenmpi-dev openmpi-bin
 
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - run: git config --global --add safe.directory /__w/fds/fds
 
     - name: set linux-gnu compiler
@@ -168,7 +168,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: install openmpi
         run: brew install gcc@15 open-mpi
@@ -246,7 +246,7 @@ jobs:
         shell: cmd
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
       # install oneapi components from web installer based on
       # oneapi-ci/scripts/install_windows.bat
diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 2c947b621b..3b713e14c4 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -39,7 +39,7 @@ jobs:
           mkl@2025.2.0
         prune: false       
          
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: build fds debug
       run: |
@@ -74,7 +74,7 @@ jobs:
           mkl@2025.1.0
         prune: false  
 
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: build fds debug
       run: |
         source /opt/intel/oneapi/setvars.sh
@@ -96,7 +96,7 @@ jobs:
     runs-on: [ubuntu-latest]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - uses: actions/setup-python@v6
       with:
diff --git a/.github/workflows/osx.yml b/.github/workflows/osx.yml
index 6f926ebc28..ddb1fe2778 100644
--- a/.github/workflows/osx.yml
+++ b/.github/workflows/osx.yml
@@ -34,7 +34,7 @@ jobs:
         shell: bash
         
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: install openmpi
       run: |
         brew install gcc@15 open-mpi
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 5ea78b3ad0..76b0d57e37 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -44,7 +44,7 @@ jobs:
         shell: cmd
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
       # install oneapi components from web installer based on
       # oneapi-ci/scripts/install_windows.bat