diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 31e4e7830..e55dfc605 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -29,7 +29,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Setup Python
       if: matrix.language == 'python'
       uses: actions/setup-python@v6
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 4a7af193d..1de5e968b 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -17,7 +17,7 @@ jobs:
           sudo apt-get update
           sudo apt-get install cxxtest lcov
       - name: Checkout JSBSim
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Configure JSBSim
         run: |
           mkdir build && cd build
diff --git a/.github/workflows/cpp-python-build.yml b/.github/workflows/cpp-python-build.yml
index 996d65fa1..57a2b7e2e 100644
--- a/.github/workflows/cpp-python-build.yml
+++ b/.github/workflows/cpp-python-build.yml
@@ -19,7 +19,7 @@ jobs:
           sudo apt-get update
           sudo apt-get install libxml2-utils
       - name: Checkout JSBSim
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Validate scripts files
         run: |
           for filename in scripts/*.xml; do
@@ -55,7 +55,7 @@ jobs:
     runs-on: ${{matrix.os}}
     steps:
       - name: Checkout JSBSim
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Configure the MSIS test program
         run: |
           mkdir build && cd build
@@ -97,7 +97,7 @@ jobs:
           sudo apt-get update
           sudo apt-get install cxxtest valgrind binutils-dev
       - name: Checkout JSBSim
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Cache Python packages & CTest cost data
         # CTestCostData.txt is used by CTest to optimize the distribution of the
         # tests between the CPU cores and reduce execution time.
@@ -124,7 +124,7 @@ jobs:
       - name: Checkout Backward-cpp
         if: matrix.display_stack_trace == 'ON'
         id: BackwardCppCheckout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: bombela/backward-cpp
           ref: 'v1.6'
@@ -186,7 +186,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout JSBSim
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up Matlab
         uses: matlab-actions/setup-matlab@v2
         with:
@@ -256,9 +256,9 @@ jobs:
         with:
           python-version: '3.10'
       - name: Checkout JSBSim
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Checkout CxxTest
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: CxxTest/cxxtest
           ref: '4.4'
@@ -303,7 +303,7 @@ jobs:
         shared_libs: [ON, OFF]
     steps:
       - name: Checkout JSBSim
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Cache Python packages & CTest cost data
         # CTestCostData.txt is used by CTest to optimize the distribution of the
         # tests between the CPU cores and reduce execution time.
@@ -320,7 +320,7 @@ jobs:
       - name: Install Python packages
         run: pip install -r python/requirements.txt
       - name: Checkout CxxTest
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: CxxTest/cxxtest
           ref: '4.4'
@@ -331,7 +331,7 @@ jobs:
           cp python/python3/cxxtest/*.py cxxtest/.
           cp python/python3/scripts/cxxtestgen .
       - name: Checkout Backward-cpp
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: bombela/backward-cpp
           ref: 'v1.6'
@@ -385,9 +385,9 @@ jobs:
     runs-on: windows-2022
     steps:
       - name: Checkout JSBSim
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Checkout JSBSim logos
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: JSBSim-Team/jsbsim-logo
           path: jsbsim-logo
@@ -455,7 +455,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout JSBSim
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Cache Python packages & CTest cost data
         # CTestCostData.txt is used by CTest to optimize the distribution of the
         # tests between the CPU cores and reduce execution time.
@@ -484,7 +484,7 @@ jobs:
           perl -i -pe 's/^(GENERATE_HTML\s*=\s*)YES/\1NO/g' doc/JSBSim.dox.in
           perl -i -pe 's/^(HAVE_DOT\s*=\s*)YES/\1NO/g' doc/JSBSim.dox.in
       - name: Checkout CxxTest
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: CxxTest/cxxtest
           ref: '4.4'
@@ -604,7 +604,7 @@ jobs:
 
     steps:
       - name: Checkout JSBSim
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up Python 3.9
         uses: actions/setup-python@v6
         with:
@@ -827,7 +827,7 @@ jobs:
 
       # Bump version
       - name: Checkout JSBSim
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Bump version
@@ -861,7 +861,7 @@ jobs:
 
       # Bump stable version of the `master` branch
       - name: Checkout JSBSim master branch
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: master
           path: _master
@@ -905,7 +905,7 @@ jobs:
       - name: Install Python packages
         run: pip install -U 'numpy>=1.20' sphinx cython
       - name: Checkout JSBSim
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Configure JSBSim
         run: |
           mkdir build && cd build