diff --git a/.github/workflows/claude-code-review.yml b/.github/workflows/claude-code-review.yml
index 0d07e27..bec9855 100644
--- a/.github/workflows/claude-code-review.yml
+++ b/.github/workflows/claude-code-review.yml
@@ -191,7 +191,7 @@ jobs:
           done
 
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0  # Full history for reliable diff comparisons
           token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/claude-dispatch.yml b/.github/workflows/claude-dispatch.yml
index 2896d2f..d3b9976 100644
--- a/.github/workflows/claude-dispatch.yml
+++ b/.github/workflows/claude-dispatch.yml
@@ -18,7 +18,7 @@ jobs:
       id-token: write
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 1
 
diff --git a/.github/workflows/claude.yml b/.github/workflows/claude.yml
index c98dd25..62968ab 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@v5
         with:
           fetch-depth: 1
 
diff --git a/.github/workflows/pre-commit.yml b/.github/workflows/pre-commit.yml
index 0b3b64d..16dcd49 100644
--- a/.github/workflows/pre-commit.yml
+++ b/.github/workflows/pre-commit.yml
@@ -26,7 +26,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/security.yml b/.github/workflows/security.yml
index aadda03..ad95efa 100644
--- a/.github/workflows/security.yml
+++ b/.github/workflows/security.yml
@@ -15,7 +15,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     - name: Setup Python
       uses: actions/setup-python@v5
@@ -100,7 +100,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     - name: Setup Python
       uses: actions/setup-python@v5
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1555204..82c4930 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -22,7 +22,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     - name: Setup Go
       uses: actions/setup-go@v5
@@ -55,7 +55,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     - name: Setup Go
       uses: actions/setup-go@v5
@@ -99,7 +99,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     - name: Setup Go
       uses: actions/setup-go@v5
diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 0b2e16b..4f77d1f 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -17,7 +17,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     - name: Setup Terraform
       uses: hashicorp/setup-terraform@v3
@@ -77,7 +77,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     - name: Setup Terraform
       uses: hashicorp/setup-terraform@v3