diff --git a/.github/workflows/branch-protection.yml b/.github/workflows/branch-protection.yml
index a2498a8..3c8df52 100644
--- a/.github/workflows/branch-protection.yml
+++ b/.github/workflows/branch-protection.yml
@@ -14,7 +14,7 @@ jobs:
     
     steps:
     - name: 📥 Checkout main
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         ref: main
         
diff --git a/.github/workflows/claude-code-review.yml b/.github/workflows/claude-code-review.yml
index 5e84209..945755f 100644
--- a/.github/workflows/claude-code-review.yml
+++ b/.github/workflows/claude-code-review.yml
@@ -24,7 +24,7 @@ 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 24870a1..d01cc1b 100644
--- a/.github/workflows/claude.yml
+++ b/.github/workflows/claude.yml
@@ -30,7 +30,7 @@ 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/expert-review.yml b/.github/workflows/expert-review.yml
index cf40eb8..0b32f26 100644
--- a/.github/workflows/expert-review.yml
+++ b/.github/workflows/expert-review.yml
@@ -26,7 +26,7 @@ jobs:
     
     steps:
     - name: 📥 Checkout code
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0  # Need full history for proper diff analysis
       
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1873ae7..ffb0f19 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,7 +17,7 @@ jobs:
     
     steps:
     - name: 📥 Checkout code
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       
     - name: 🐍 Set up Python
       uses: actions/setup-python@v4
@@ -108,7 +108,7 @@ jobs:
     
     steps:
     - name: 📥 Checkout code
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       
     - name: 🐍 Set up Python  
       uses: actions/setup-python@v4
@@ -143,7 +143,7 @@ jobs:
     
     steps:
     - name: 📥 Checkout code
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       
     - name: 🐍 Set up Python
       uses: actions/setup-python@v4
@@ -175,7 +175,7 @@ jobs:
     
     steps:
     - name: 📥 Checkout code
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       
     - name: 🐍 Set up Python
       uses: actions/setup-python@v4