diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6ae7a792..fdac1195 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -46,7 +46,7 @@ jobs:
     runs-on: ${{ inputs.runner }}
     timeout-minutes: 60
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: DeterminateSystems/determinate-nix-action@main
       - uses: DeterminateSystems/flakehub-cache-action@main
       - run: nix build .#packages.${{ inputs.system }}.default .#packages.${{ inputs.system }}.binaryTarball --no-link -L
@@ -63,7 +63,7 @@ jobs:
     runs-on: ${{ inputs.runner }}
     timeout-minutes: 60
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: DeterminateSystems/determinate-nix-action@main
       - uses: DeterminateSystems/flakehub-cache-action@main
       - run: nix flake check -L --system ${{ inputs.system }}
@@ -72,7 +72,7 @@ jobs:
     needs: build
     runs-on: ${{ inputs.runner_for_virt }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: DeterminateSystems/determinate-nix-action@main
       - uses: DeterminateSystems/flakehub-cache-action@main
       - run: |
@@ -87,7 +87,7 @@ jobs:
     needs: build
     runs-on: ${{ inputs.runner_for_virt }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: DeterminateSystems/determinate-nix-action@main
       - uses: DeterminateSystems/flakehub-cache-action@main
       - run: |
@@ -133,14 +133,14 @@ jobs:
           - "[s-z]*"
     steps:
       - name: Checkout nix
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Checkout flake-regressions
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: DeterminateSystems/flake-regressions
           path: flake-regressions
       - name: Checkout flake-regressions-data
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: DeterminateSystems/flake-regressions-data
           path: flake-regressions/tests
@@ -187,7 +187,7 @@ jobs:
       deployments: "write"
     steps:
       - name: Checkout nix
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - uses: DeterminateSystems/determinate-nix-action@main
       - uses: DeterminateSystems/flakehub-cache-action@main
       - name: Build manual
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9880d4fb..01be867b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,7 +21,7 @@ jobs:
   eval:
     runs-on: UbuntuLatest32Cores128G
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: DeterminateSystems/determinate-nix-action@main
@@ -74,7 +74,7 @@ jobs:
         if: |
           contains(needs.*.result, 'failure') ||
           contains(needs.*.result, 'cancelled')
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: DeterminateSystems/determinate-nix-action@main
       - name: Create artifacts directory
         run: mkdir -p ./artifacts
@@ -112,7 +112,7 @@ jobs:
       contents: write
       id-token: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: DeterminateSystems/determinate-nix-action@main
       - uses: DeterminateSystems/flakehub-push@main
         with: