diff --git a/.github/workflows/build-fmusim-gui.yml b/.github/workflows/build-fmusim-gui.yml
index 09511834..cddd415d 100644
--- a/.github/workflows/build-fmusim-gui.yml
+++ b/.github/workflows/build-fmusim-gui.yml
@@ -11,7 +11,7 @@ jobs:
   build-fmusim-gui:
     runs-on: windows-2019
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: actions/setup-python@v5
       with:
         python-version: '3.10'
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 58a397d9..8849463c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -12,7 +12,7 @@ jobs:
   lint-files:
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - run: python3 build/lint_files.py
 
   build:
@@ -40,7 +40,7 @@ jobs:
     runs-on: ${{ matrix.image }}
     needs: lint-files
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: actions/setup-python@v5
       with:
         python-version: '3.10'
@@ -71,7 +71,7 @@ jobs:
       with:
         conda-channels: conda-forge
     - run: python -m pip install fmpy==0.3.20 pytest scipy kaleido markdown2 plotly pytz
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: actions/download-artifact@v4
       with:
         name: x86-windows