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docs/deployment/package-update-guide.md

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+# Package Update Recommendations
+
+## ✅ Current Status
+- **0 security vulnerabilities** found
+- All packages are at their "wanted" versions (within semver range)
+- System is stable and secure
+
+## 📋 Update Recommendations
+
+### ⚠️ **DO NOT UPDATE** (Critical Dependencies)
+
+1. **prom-client** (13.2.0 → 15.1.3)
+   - **Reason**: Required for `express-prometheus-middleware@1.2.0` compatibility
+   - **Status**: Keep at 13.2.0 (peer dependency conflict would occur)
+
+### 🔄 **Major Version Updates** (Require Testing & Code Review)
+
+These major version updates have breaking changes and should be carefully evaluated:
+
+2. **express** (4.22.1 → 5.2.1) - **Major**
+   - Breaking changes in Express 5.x
+   - Requires thorough testing of all routes and middleware
+   - Recommendation: **Defer** until Express 5.x ecosystem is mature
+
+3. **helmet** (7.2.0 → 8.1.0) - **Major**
+   - Security middleware - needs careful testing
+   - Recommendation: **Update with testing** (security-related)
+
+4. **jest** (29.7.0 → 30.2.0) - **Major**
+   - Testing framework - breaking changes possible
+   - Recommendation: **Update in test branch first**
+
+5. **uuid** (9.0.1 → 13.0.0) - **Major**
+   - Multiple major versions jumped
+   - Recommendation: **Update carefully** (API changes likely)
+
+6. **zod** (3.25.76 → 4.2.1) - **Major**
+   - Schema validation - used extensively
+   - Recommendation: **Update with testing** (breaking changes in v4)
+
+7. **redis** (4.7.1 → 5.10.0) - **Major**
+   - Database client - critical dependency
+   - Recommendation: **Update with extensive testing**
+
+8. **joi** (17.13.3 → 18.0.2) - **Major**
+   - Validation library - used in gateway
+   - Recommendation: **Update with testing** (API may have changed)
+
+9. **dotenv** (16.6.1 → 17.2.3) - **Major**
+   - Environment variables - simple library
+   - Recommendation: **Safe to update** (likely minimal breaking changes)
+
+10. **bcryptjs** (2.4.3 → 3.0.3) - **Major**
+    - Password hashing - security critical
+    - Recommendation: **Update with testing** (verify hash compatibility)
+
+### 🔧 **Dev Dependencies** (Safer to Update)
+
+11. **@types/node** (20.19.27 → 25.0.3) - **Major**
+    - Type definitions only
+    - Recommendation: **Update gradually** (may need code changes)
+
+12. **@types/express** (4.17.25 → 5.0.6) - **Major**
+    - Type definitions for Express 5
+    - Recommendation: **Only update if Express is updated**
+
+13. **@types/jest** (29.5.14 → 30.0.0) - **Major**
+    - Type definitions only
+    - Recommendation: **Update if Jest is updated**
+
+14. **@types/uuid** (9.0.8 → 10.0.0) - **Major**
+    - Type definitions only
+    - Recommendation: **Update if uuid is updated**
+
+15. **@typescript-eslint/*** (6.21.0 → 8.50.1) - **Major**
+    - ESLint plugins - dev tooling
+    - Recommendation: **Update with config review**
+
+16. **eslint** (8.57.1 → 9.39.2) - **Major**
+    - Linting tool - dev dependency
+    - Recommendation: **Update with config migration** (ESLint 9 has flat config)
+
+17. **supertest** (6.3.4 → 7.1.4) - **Major**
+    - Testing library
+    - Recommendation: **Update with test review**
+
+18. **winston-daily-rotate-file** (4.7.1 → 5.0.0) - **Major**
+    - Logging utility
+    - Recommendation: **Update with testing**
+
+## 🎯 Recommended Update Strategy
+
+### Phase 1: Low-Risk Updates (Can do now)
+- `dotenv` → 17.2.3 (simple env var loader)
+
+### Phase 2: Medium-Risk Updates (Test first)
+- `helmet` → 8.1.0 (security middleware)
+- `winston-daily-rotate-file` → 5.0.0 (logging)
+- `bcryptjs` → 3.0.3 (with hash compatibility testing)
+
+### Phase 3: Higher-Risk Updates (Require extensive testing)
+- `zod` → 4.2.1 (validation schema changes)
+- `joi` → 18.0.2 (validation changes)
+- `redis` → 5.10.0 (client API changes)
+- `uuid` → 13.0.0 (API changes)
+
+### Phase 4: Framework Updates (Major refactoring)
+- `express` → 5.2.1 (requires route/middleware review)
+- `jest` → 30.2.0 (test framework changes)
+- ESLint ecosystem → v9 (config migration needed)
+
+## 📝 Update Process
+
+1. **Create feature branch** for each update category
+2. **Update package.json** with new version
+3. **Run `npm install`**
+4. **Fix compilation errors** (TypeScript/imports)
+5. **Run test suite** (`npm test`)
+6. **Manual testing** of affected functionality
+7. **Code review**
+8. **Merge to main**
+
+## ⚡ Quick Update Script
+
+To update specific packages safely:
+
+```bash
+# Update single package
+npm install package@latest
+
+# Update and test
+npm install package@latest && npm test
+
+# Check for breaking changes
+npm outdated package
+```
+
+## 🔒 Security Priority
+
+If security vulnerabilities are found:
+1. **Critical/High**: Update immediately (even if major version)
+2. **Medium**: Update in next maintenance window
+3. **Low**: Update in regular cycle
+
+---
+
+**Last Updated**: 2025-12-28
+**Current Status**: ✅ All packages secure, no vulnerabilities
+