diff --git a/.github/workflows/add-release-assets.yml b/.github/workflows/add-release-assets.yml
index df469a97..2a83e752 100644
--- a/.github/workflows/add-release-assets.yml
+++ b/.github/workflows/add-release-assets.yml
@@ -13,7 +13,7 @@ jobs:
       - name: Python dependencies
         run: python -m pip install git-archive-all
       - name: Clone fabm-plus
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: fabm-model/fabm-plus
           submodules: recursive
diff --git a/.github/workflows/fabm.yml b/.github/workflows/fabm.yml
index b72443b0..d103e801 100644
--- a/.github/workflows/fabm.yml
+++ b/.github/workflows/fabm.yml
@@ -45,7 +45,7 @@ jobs:
           sudo apt-get update
           sudo apt-get install gfortran-${{ matrix.version }}
       - name: Clone repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Run all test cases with host emulators
@@ -70,7 +70,7 @@ jobs:
       - name: Install compiler and Python dependencies
         run: conda install gfortran_linux-64=${{ matrix.version }} pip pyyaml
       - name: Clone repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Run all test cases with host emulators
@@ -113,7 +113,7 @@ jobs:
           wget --no-verbose ${{ matrix.url_dir }}/l_fortran-compiler_p_${{ matrix.version }}_offline.sh
           /bin/sh l_fortran-compiler_p_${{ matrix.version }}_offline.sh -a --silent --cli --install-dir ${HOME}/intel --eula accept
       - name: Clone repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Run all test cases with host emulators
@@ -161,7 +161,7 @@ jobs:
           wget --no-verbose ${{ matrix.url_dir }}/${{ matrix.version }}_offline.sh
           /bin/sh ${{ matrix.version }}_offline.sh -a --silent --cli --install-dir ${HOME}/intel --eula accept
       - name: Clone repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Run all test cases with host emulators
@@ -223,7 +223,7 @@ jobs:
           NVHPC_INSTALL_DIR: /home/runner/nvhpc
           NVHPC_INSTALL_TYPE: single
       - name: Clone repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Run all test cases with host emulators
@@ -264,7 +264,7 @@ jobs:
           rm aocc-compiler-${{ matrix.version }}.tar
           ./aocc-compiler-${{ matrix.version }}/install.sh
       - name: Clone repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Run all test cases with host emulators
@@ -299,7 +299,7 @@ jobs:
       - name: Install Python dependencies
         run: conda install -c conda-forge pyyaml flang>=21.0 ninja c-compiler flang-rt_win-64
       - name: Clone repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Run all test cases with host emulators
@@ -324,7 +324,7 @@ jobs:
         shell: bash -el {0}
     steps:
       - name: Clone repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Set up Python ${{ matrix.python-version }} with conda
@@ -375,11 +375,11 @@ jobs:
           sudo apt-get update
           sudo apt-get install libnetcdff-dev
       - name: Clone FABM
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Clone GOTM
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: gotm-model/code
           ref: v6.0
@@ -398,7 +398,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Clone FABM
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Download and extract cmake
@@ -414,7 +414,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Clone FABM
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Install Ninja
@@ -433,7 +433,7 @@ jobs:
         shell: bash -el {0}
     steps:
       - name: Clone repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Set up Python with conda
@@ -451,7 +451,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Clone FABM
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Build
         run: |
           cmake -S . -B build -DFABM_REAL_KIND='SELECTED_REAL_KIND(6)'