diff --git a/.github/workflows/arch-matrix.yml b/.github/workflows/arch-matrix.yml
index 4ef291b..aeb1c2f 100644
--- a/.github/workflows/arch-matrix.yml
+++ b/.github/workflows/arch-matrix.yml
@@ -113,7 +113,7 @@ jobs:
             https://sh.rustup.rs \
             | sh -s -- -y --default-toolchain stable --profile minimal
           echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Cache /opt/adaptivecpp
         id: cache-adaptivecpp
         uses: actions/cache@v4
diff --git a/.github/workflows/install-matrix.yml b/.github/workflows/install-matrix.yml
index b66a9ec..229b96f 100644
--- a/.github/workflows/install-matrix.yml
+++ b/.github/workflows/install-matrix.yml
@@ -128,7 +128,7 @@ jobs:
               --build-arg XCHPLOT2_BUILD_CUDA=OFF
               --build-arg INSTALL_CUDA_HEADERS=1
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: podman build (${{ matrix.target.name }})
         run: |
           podman build -t xchplot2-ci:${{ matrix.target.name }} \