diff --git a/.github/workflows/ci-cd.yml b/.github/workflows/ci-cd.yml
index f134bcb..d892281 100644
--- a/.github/workflows/ci-cd.yml
+++ b/.github/workflows/ci-cd.yml
@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Node.js
         uses: actions/setup-node@v4
@@ -39,7 +39,7 @@ jobs:
     needs: [lint-and-type-check]
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Node.js
         uses: actions/setup-node@v4
@@ -67,7 +67,7 @@ jobs:
     needs: [lint-and-type-check]
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Node.js
         uses: actions/setup-node@v4
@@ -91,7 +91,7 @@ jobs:
         service: [web, api, ml-api]
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -121,7 +121,7 @@ jobs:
     if: github.event_name == 'push' && github.ref == 'refs/heads/main'
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Deploy notification
         run: echo "Deployment would happen here. Configure with your deployment platform (Vercel, Railway, Fly.io, etc.)"
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 020cb94..4f33735 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,7 +9,7 @@ jobs:
   lint-python:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: '3.11'
@@ -23,7 +23,7 @@ jobs:
   lint-typescript:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v4
         with:
           node-version: '20'
@@ -33,7 +33,7 @@ jobs:
   typecheck-python:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: '3.11'
@@ -64,7 +64,7 @@ jobs:
         image: redis:7-alpine
         ports: ['6379:6379']
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: '3.11'
@@ -91,7 +91,7 @@ jobs:
   test-typescript:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v4
         with:
           node-version: '20'
@@ -105,7 +105,7 @@ jobs:
       matrix:
         service: [api-python, web, worker]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: docker/setup-buildx-action@v3
       - uses: docker/build-push-action@v5
         with:
@@ -119,7 +119,7 @@ jobs:
   security-scan:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Run Trivy vulnerability scanner
         uses: aquasecurity/trivy-action@master
         with:
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 186eece..b25f174 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -20,7 +20,7 @@ jobs:
       matrix:
         service: [api-python, web, worker]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: docker/setup-buildx-action@v3
       - uses: docker/login-action@v3
         with:
@@ -44,7 +44,7 @@ jobs:
     runs-on: ubuntu-latest
     environment: staging
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Set up kubectl
         uses: azure/setup-kubectl@v3
       - name: Configure AWS credentials
@@ -71,7 +71,7 @@ jobs:
     runs-on: ubuntu-latest
     environment: production
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Set up kubectl
         uses: azure/setup-kubectl@v3
       - name: Configure AWS credentials
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 5dc6957..3324be8 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -10,7 +10,7 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Generate changelog