diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 42144fb..91754eb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,7 +25,7 @@ jobs:
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v5
@@ -104,7 +104,7 @@ jobs:
   security:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Set up Python
       uses: actions/setup-python@v5
@@ -137,7 +137,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: [test, security]
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Set up Python
       uses: actions/setup-python@v5
@@ -168,7 +168,7 @@ jobs:
     if: github.ref == 'refs/heads/main'
     needs: [test]
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Set up Python
       uses: actions/setup-python@v5
diff --git a/.github/workflows/claude-code-review.yml b/.github/workflows/claude-code-review.yml
index 3c52493..a1837b7 100644
--- a/.github/workflows/claude-code-review.yml
+++ b/.github/workflows/claude-code-review.yml
@@ -32,7 +32,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 1
 
diff --git a/.github/workflows/claude-dispatch.yml b/.github/workflows/claude-dispatch.yml
index beaadb4..3c41e4a 100644
--- a/.github/workflows/claude-dispatch.yml
+++ b/.github/workflows/claude-dispatch.yml
@@ -16,7 +16,7 @@ jobs:
       id-token: write
     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 fab4b58..426200b 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/optimize-images.yml b/.github/workflows/optimize-images.yml
index 3ede509..e01a3db 100644
--- a/.github/workflows/optimize-images.yml
+++ b/.github/workflows/optimize-images.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Install optimization tools
         run: |