Clerk Upgrade & Migration

Overview

Safely upgrade Clerk SDK versions and handle breaking changes.

Prerequisites

• Current Clerk integration working
• Git repository with clean working state
• Test environment available

Instructions

Step 1: Check Current Version and Available Updates

# Check current version
npm list @clerk/nextjs

# Check for updates
npm outdated @clerk/nextjs

# View changelog
npm view @clerk/nextjs versions --json | tail -20

Step 2: Review Breaking Changes

// Common breaking changes by major version:

// v5 -> v6 Changes:
// - clerkMiddleware() replaces authMiddleware()
// - auth() is now async
// - Removed deprecated hooks
// - New createRouteMatcher() API

// Before (v5)
import { authMiddleware } from '@clerk/nextjs'
export default authMiddleware({
  publicRoutes: ['/']
})

// After (v6)
import { clerkMiddleware, createRouteMatcher } from '@clerk/nextjs/server'
const isPublicRoute = createRouteMatcher(['/'])
export default clerkMiddleware(async (auth, req) => {
  if (!isPublicRoute(req)) await auth.protect()
})

Step 3: Upgrade Process

# 1. Create upgrade branch
git checkout -b upgrade-clerk-sdk

# 2. Update package
npm install @clerk/nextjs@latest

# 3. Check for peer dependency issues
npm ls @clerk/nextjs

# 4. Run type checking
npm run typecheck

# 5. Run tests
npm test

Step 4: Handle Common Migration Patterns

Middleware Migration (v5 to v6)

// OLD: authMiddleware (deprecated)
import { authMiddleware } from '@clerk/nextjs'

export default authMiddleware({
  publicRoutes: ['/', '/sign-in', '/sign-up'],
  ignoredRoutes: ['/api/webhooks(.*)']
})

// NEW: clerkMiddleware
import { clerkMiddleware, createRouteMatcher } from '@clerk/nextjs/server'

const isPublicRoute = createRouteMatcher([
  '/',
  '/sign-in(.*)',
  '/sign-up(.*)'
])

export default clerkMiddleware(async (auth, request) => {
  if (!isPublicRoute(request)) {
    await auth.protect()
  }
})

Async Auth Migration

// OLD: Synchronous auth
import { auth } from '@clerk/nextjs'

export function GET() {
  const { userId } = auth()  // Synchronous
  // ...
}

// NEW: Async auth
import { auth } from '@clerk/nextjs/server'

export async function GET() {
  const { userId } = await auth()  // Async
  // ...
}

Hook Updates

// OLD: useAuth() changes
const { isSignedIn, isLoaded } = useAuth()

// NEW: Check specific deprecations
// useAuth() still works but some properties changed

// OLD: Deprecated organization hooks
import { useOrganization } from '@clerk/nextjs'
const { membership } = useOrganization()

// NEW: Updated API
import { useOrganization } from '@clerk/nextjs'
const { organization, membership } = useOrganization()

Step 5: Update Import Paths

// Server imports (Next.js App Router)
import { auth, currentUser, clerkClient } from '@clerk/nextjs/server'

// Client imports
import { useUser, useAuth, useClerk } from '@clerk/nextjs'

// Component imports
import {
  ClerkProvider,
  SignIn,
  SignUp,
  UserButton,
  SignInButton,
  SignUpButton
} from '@clerk/nextjs'

Step 6: Test Upgrade

// tests/clerk-upgrade.test.ts
import { describe, it, expect } from 'vitest'

describe('Clerk Upgrade Validation', () => {
  it('auth() returns userId for authenticated users', async () => {
    // Mock or integration test
  })

  it('middleware protects routes correctly', async () => {
    // Test protected routes return 401/redirect
  })

  it('webhooks still verify correctly', async () => {
    // Test webhook signature verification
  })
})

Step 7: Rollback Plan

# If upgrade fails, rollback:
git checkout main -- package.json package-lock.json
npm install

# Or restore from specific version
npm install @clerk/nextjs@5.7.1  # Previous version

Version Compatibility Matrix

@clerk/nextjs	Next.js	Node.js
6.x	14.x, 15.x	18.x, 20.x
5.x	13.x, 14.x	18.x, 20.x
4.x	12.x, 13.x	16.x, 18.x

Migration Checklist

• Backup current package.json
• Review changelog for breaking changes
• Update @clerk/nextjs package
• Update middleware to clerkMiddleware
• Make auth() calls async
• Update deprecated hooks
• Fix import paths
• Run type checking
• Run tests
• Test authentication flows manually
• Deploy to staging
• Monitor for errors
• Deploy to production

Output

• Updated Clerk SDK
• Migrated breaking changes
• All tests passing
• Production deployment ready

Error Handling

Error	Cause	Solution
Type errors after upgrade	API changes	Check changelog, update types
Middleware not executing	Matcher syntax changed	Update matcher regex
auth() returns Promise	Now async in v6	Add await to auth() calls
Import errors	Path changes	Update to @clerk/nextjs/server

Resources

• Clerk Changelog
• Migration Guides
• GitHub Releases

Next Steps

After upgrade, review

clerk-ci-integration

for CI/CD updates.