diff --git a/.github/workflows/changelog.yml b/.github/workflows/changelog.yml
index 9ebe880f..0933aa7c 100644
--- a/.github/workflows/changelog.yml
+++ b/.github/workflows/changelog.yml
@@ -15,7 +15,7 @@ jobs:
   validate:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
diff --git a/.github/workflows/issues.yml b/.github/workflows/issues.yml
index 9afd4270..376ef972 100644
--- a/.github/workflows/issues.yml
+++ b/.github/workflows/issues.yml
@@ -14,7 +14,7 @@ jobs:
   issues-agent:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup Node.js
         uses: actions/setup-node@v4
diff --git a/.github/workflows/labeling.yml b/.github/workflows/labeling.yml
index 5967d353..3fd589b6 100644
--- a/.github/workflows/labeling.yml
+++ b/.github/workflows/labeling.yml
@@ -54,7 +54,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
           ref: develop
diff --git a/.github/workflows/linting.yml b/.github/workflows/linting.yml
index be01331d..8aeb5c35 100644
--- a/.github/workflows/linting.yml
+++ b/.github/workflows/linting.yml
@@ -8,7 +8,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v4
         with:
           node-version: 'lts/*'
diff --git a/.github/workflows/meta.yml b/.github/workflows/meta.yml
index a7a83733..61288237 100644
--- a/.github/workflows/meta.yml
+++ b/.github/workflows/meta.yml
@@ -30,7 +30,7 @@ jobs:
   front-matter-validate:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup Node.js
         uses: actions/setup-node@v4
@@ -59,7 +59,7 @@ jobs:
   lint-and-links:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: avto-dev/markdown-lint@v1
         with:
@@ -76,7 +76,7 @@ jobs:
     needs: [front-matter-validate, lint-and-links]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup Node.js
         uses: actions/setup-node@v4
@@ -102,7 +102,7 @@ jobs:
     if: ${{ (success() || failure()) && github.event_name != 'pull_request' }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.ref }}
           fetch-depth: 2
diff --git a/.github/workflows/metrics.yml b/.github/workflows/metrics.yml
index 088edfd9..7c783126 100644
--- a/.github/workflows/metrics.yml
+++ b/.github/workflows/metrics.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout (develop)
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: develop
 
diff --git a/.github/workflows/planner.yml b/.github/workflows/planner.yml
index e25dd5bf..7f0a735a 100644
--- a/.github/workflows/planner.yml
+++ b/.github/workflows/planner.yml
@@ -18,7 +18,7 @@ jobs:
     # See: .github/reports/audits/agent-infrastructure-audit-2025-12-10.md
     if: false
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup Node.js
         uses: actions/setup-node@v4
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index b036ece4..852ea934 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -11,7 +11,7 @@ jobs:
     uses: ./.github/workflows/linting.yml # reuse if using reusable workflows; else inline
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
@@ -27,7 +27,7 @@ jobs:
       contents: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           ref: develop
       - name: Setup Node
diff --git a/.github/workflows/reporting.yml b/.github/workflows/reporting.yml
index 9c2fd521..44bbd10e 100644
--- a/.github/workflows/reporting.yml
+++ b/.github/workflows/reporting.yml
@@ -62,7 +62,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Node.js
         uses: actions/setup-node@v4
@@ -142,7 +142,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Node.js
         uses: actions/setup-node@v4
@@ -232,7 +232,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Find stale reports
         id: stale
@@ -280,7 +280,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Update main README
         if: github.event.inputs.dry_run != 'true'
diff --git a/.github/workflows/reviewer.yml b/.github/workflows/reviewer.yml
index 3381619b..e57fcd98 100644
--- a/.github/workflows/reviewer.yml
+++ b/.github/workflows/reviewer.yml
@@ -14,7 +14,7 @@ jobs:
   reviewer:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup Node.js
         uses: actions/setup-node@v4
diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 8837d949..d6b51855 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -8,7 +8,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v4
         with:
           node-version-file: '.nvmrc'