diff --git a/.github/workflows/backport.yml b/.github/workflows/backport.yml
index 728a6f85d3..3c3a9f885f 100644
--- a/.github/workflows/backport.yml
+++ b/.github/workflows/backport.yml
@@ -34,7 +34,7 @@ jobs:
           permission-contents: write
           permission-pull-requests: write
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           token: ${{ steps.app-token.outputs.token }}
           ref: ${{ github.event.pull_request.head.sha }}
diff --git a/.github/workflows/flakehub-publish-rolling.yml b/.github/workflows/flakehub-publish-rolling.yml
index 914948e20c..57ee403638 100644
--- a/.github/workflows/flakehub-publish-rolling.yml
+++ b/.github/workflows/flakehub-publish-rolling.yml
@@ -14,7 +14,7 @@ jobs:
       id-token: "write"
       contents: "read"
     steps:
-      - uses: "actions/checkout@v5"
+      - uses: "actions/checkout@v6"
       - uses: "DeterminateSystems/nix-installer-action@main"
       - uses: "DeterminateSystems/flakehub-push@main"
         with:
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 338b2c0858..26864370ab 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Install Nix
         uses: cachix/install-nix-action@v31
       - name: Run treefmt check
diff --git a/.github/workflows/pr-merged.yml b/.github/workflows/pr-merged.yml
index 1589d26383..0230593ace 100644
--- a/.github/workflows/pr-merged.yml
+++ b/.github/workflows/pr-merged.yml
@@ -75,7 +75,7 @@ jobs:
       # This ensures we get the latest scripts, even if the PR's base was outdated.
       - name: Checkout base branch
         id: checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           sparse-checkout: |
             flake/dev/diff-plugins.py
diff --git a/.github/workflows/tag-maintainers.yml b/.github/workflows/tag-maintainers.yml
index 48ae8ec7b2..bb09ecbf02 100644
--- a/.github/workflows/tag-maintainers.yml
+++ b/.github/workflows/tag-maintainers.yml
@@ -40,7 +40,7 @@ jobs:
       # Checkout the code from the base branch.
       # This is a security measure for `pull_request_target` to run trusted code.
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.base_ref }}
 
diff --git a/.github/workflows/update-maintainers.yml b/.github/workflows/update-maintainers.yml
index 1d248d1993..13ee8e2fbc 100644
--- a/.github/workflows/update-maintainers.yml
+++ b/.github/workflows/update-maintainers.yml
@@ -60,7 +60,7 @@ jobs:
           } >> "$GITHUB_OUTPUT"
 
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           token: ${{ steps.app-token.outputs.token || github.token }}
 
diff --git a/.github/workflows/update-other.yml b/.github/workflows/update-other.yml
index a1c8a0240c..0603989e3b 100644
--- a/.github/workflows/update-other.yml
+++ b/.github/workflows/update-other.yml
@@ -22,7 +22,7 @@ jobs:
       branches: ${{ steps.list-branches.outputs.result }}
     steps:
       - name: Checkout version-info
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           sparse-checkout: version-info.toml
           sparse-checkout-cone-mode: false
diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index 69f32ce713..fb4a40bcba 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -79,7 +79,7 @@ jobs:
           git config --global user.email "$email"
 
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           token: ${{ steps.app-token.outputs.token }}
 
diff --git a/.github/workflows/website.yml b/.github/workflows/website.yml
index a8cac168be..8174bc3ae3 100644
--- a/.github/workflows/website.yml
+++ b/.github/workflows/website.yml
@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Checkout version-info
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           sparse-checkout: version-info.toml
           sparse-checkout-cone-mode: false
@@ -95,7 +95,7 @@ jobs:
           authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{ matrix.ref }}