diff --git a/.github/workflows/ci-cd.yml b/.github/workflows/ci-cd.yml
index 00858ad1..1cb89800 100644
--- a/.github/workflows/ci-cd.yml
+++ b/.github/workflows/ci-cd.yml
@@ -33,7 +33,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
@@ -64,7 +64,7 @@ jobs:
     timeout-minutes: 15
     needs: lint
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
@@ -107,7 +107,7 @@ jobs:
     timeout-minutes: 5
     needs: lint
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Validate Docker Compose files
         run: |
@@ -133,7 +133,7 @@ jobs:
     timeout-minutes: 10
     needs: test
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
@@ -162,7 +162,7 @@ jobs:
     timeout-minutes: 5
     needs: lint
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Install Helm
         uses: azure/setup-helm@v4
@@ -200,7 +200,7 @@ jobs:
     timeout-minutes: 5
     needs: lint
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup Terraform
         uses: hashicorp/setup-terraform@v3
@@ -227,7 +227,7 @@ jobs:
       image_tag: ${{ steps.meta.outputs.tags }}
       image_digest: ${{ steps.build-push.outputs.digest }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Configure AWS credentials
         uses: aws-actions/configure-aws-credentials@v4
@@ -276,7 +276,7 @@ jobs:
       name: staging
       url: https://staging.pos-54link.com
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Configure AWS credentials
         uses: aws-actions/configure-aws-credentials@v4
@@ -326,7 +326,7 @@ jobs:
       name: production
       url: https://pos-54link.com
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Configure AWS credentials
         uses: aws-actions/configure-aws-credentials@v4
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6085811d..68b40729 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,7 +21,7 @@ jobs:
     name: Secret Scanning (Gitleaks)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0  # Full history needed for Gitleaks commit scanning
 
@@ -44,7 +44,7 @@ jobs:
     name: TypeScript type-check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
@@ -65,7 +65,7 @@ jobs:
     name: Lint (ESLint + Prettier)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
@@ -109,7 +109,7 @@ jobs:
           --health-timeout 5s
           --health-retries 5
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
@@ -146,7 +146,7 @@ jobs:
       contents: read
       security-events: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
@@ -207,7 +207,7 @@ jobs:
       POSTGRES_URL: postgresql://localhost/placeholder
       DATABASE_URL: postgresql://localhost/placeholder
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
@@ -236,7 +236,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: build
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -285,7 +285,7 @@ jobs:
           --health-timeout 5s
           --health-retries 5
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
@@ -390,7 +390,7 @@ jobs:
           --health-timeout 5s
           --health-retries 5
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
@@ -463,7 +463,7 @@ jobs:
     needs: playwright
     if: always()
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
@@ -502,7 +502,7 @@ jobs:
     name: Go microservice tests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up Go
         uses: actions/setup-go@v5
@@ -559,7 +559,7 @@ jobs:
     name: Python microservice tests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v5
@@ -661,7 +661,7 @@ jobs:
           --health-timeout 5s
           --health-retries 5
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
@@ -764,7 +764,7 @@ jobs:
     name: Prometheus alert rule validation
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Install promtool
         run: |
@@ -800,7 +800,7 @@ jobs:
       issues: write
       security-events: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up Node.js
         uses: actions/setup-node@v4
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 5e76c765..4c5ac503 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -32,7 +32,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v3
@@ -93,7 +93,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v3
@@ -150,7 +150,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v3
diff --git a/.github/workflows/db-migration-check.yml b/.github/workflows/db-migration-check.yml
index 93df2dff..47266a4b 100644
--- a/.github/workflows/db-migration-check.yml
+++ b/.github/workflows/db-migration-check.yml
@@ -30,7 +30,7 @@ jobs:
           --health-timeout 5s
           --health-retries 5
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index cdf2e2f9..2ad026e3 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -37,7 +37,7 @@ jobs:
       image-tag: ${{ steps.meta.outputs.tags }}
       image-digest: ${{ steps.build.outputs.digest }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Log in to GitHub Container Registry
         uses: docker/login-action@v3
@@ -79,7 +79,7 @@ jobs:
     needs: build-and-push
     environment: ${{ github.event.inputs.environment || 'production' }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
diff --git a/.github/workflows/e2e-playwright.yml b/.github/workflows/e2e-playwright.yml
index 890d420c..bd833c8c 100644
--- a/.github/workflows/e2e-playwright.yml
+++ b/.github/workflows/e2e-playwright.yml
@@ -70,7 +70,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
diff --git a/.github/workflows/infrastructure.yml b/.github/workflows/infrastructure.yml
index 6c1f6f43..b11317b5 100644
--- a/.github/workflows/infrastructure.yml
+++ b/.github/workflows/infrastructure.yml
@@ -33,7 +33,7 @@ jobs:
       matrix:
         environment: [dev, staging, production]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Configure AWS credentials
         uses: aws-actions/configure-aws-credentials@v4
@@ -93,7 +93,7 @@ jobs:
     environment:
       name: infrastructure-production
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Configure AWS credentials
         uses: aws-actions/configure-aws-credentials@v4
diff --git a/.github/workflows/security-scan.yml b/.github/workflows/security-scan.yml
index 91c1985f..6914e21c 100644
--- a/.github/workflows/security-scan.yml
+++ b/.github/workflows/security-scan.yml
@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: pnpm/action-setup@v4
 
@@ -39,7 +39,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 15
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Build Docker image
         run: docker build -t pos-54link:scan .
@@ -67,7 +67,7 @@ jobs:
       matrix:
         language: [javascript-typescript]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v3
@@ -85,7 +85,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 5
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
@@ -99,7 +99,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Run tfsec
         uses: aquasecurity/tfsec-action@v1.0.3
@@ -126,7 +126,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Install Helm
         uses: azure/setup-helm@v4