diff --git a/.github/workflows/claude-code-review.yml b/.github/workflows/claude-code-review.yml
index 5bf8ce5..7c09473 100644
--- a/.github/workflows/claude-code-review.yml
+++ b/.github/workflows/claude-code-review.yml
@@ -27,7 +27,7 @@ jobs:
     
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 1
 
diff --git a/.github/workflows/claude-issue-summarize.yml b/.github/workflows/claude-issue-summarize.yml
index 710195f..ba2a17d 100644
--- a/.github/workflows/claude-issue-summarize.yml
+++ b/.github/workflows/claude-issue-summarize.yml
@@ -14,7 +14,7 @@ jobs:
       issues: write
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.ref }}
 
diff --git a/.github/workflows/claude-issue-triage.yml b/.github/workflows/claude-issue-triage.yml
index ddec43e..d8dd5cb 100644
--- a/.github/workflows/claude-issue-triage.yml
+++ b/.github/workflows/claude-issue-triage.yml
@@ -14,7 +14,7 @@ jobs:
       issues: write
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.ref }}
           
diff --git a/.github/workflows/claude-ontology-review.yml b/.github/workflows/claude-ontology-review.yml
index 1f847b0..7318518 100644
--- a/.github/workflows/claude-ontology-review.yml
+++ b/.github/workflows/claude-ontology-review.yml
@@ -29,7 +29,7 @@ jobs:
     
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 1
 
diff --git a/.github/workflows/claude.yml b/.github/workflows/claude.yml
index e1d4a43..9aecb5f 100644
--- a/.github/workflows/claude.yml
+++ b/.github/workflows/claude.yml
@@ -26,7 +26,7 @@ jobs:
       actions: read # Required for Claude to read CI results on PRs
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 1
 
diff --git a/.github/workflows/dragon-ai.yml b/.github/workflows/dragon-ai.yml
index 584bb43..995e725 100644
--- a/.github/workflows/dragon-ai.yml
+++ b/.github/workflows/dragon-ai.yml
@@ -21,7 +21,7 @@ jobs:
       result: ${{ steps.check.outputs.result }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         # this seems to be necessary to ensure actions uses the latest; see
         # https://github.com/actions/checkout/issues/439
         with:
@@ -101,7 +101,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.ref }}
           token: ${{ secrets.PAT_FOR_PR }}  # Use PAT for checkout to allow committing later