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Upgrading Next.js

Upgrading Next.js

Section titled “Upgrading Next.js”

Introduction

Section titled “Introduction”

Next.js releases major versions with new features, performance improvements, and breaking changes. Upgrading requires planning and testing.

Why Do We Need This?

Section titled “Why Do We Need This?”

Each new version of Next.js includes performance improvements, new features, and security patches. Staying current gives you access to the latest capabilities.

Checking Your Version

Section titled “Checking Your Version”
Terminal window
# Check installed version
npx next --version


# Check what's available
npm show next version     # Latest stable
npm show next versions    # All versions

Upgrade Steps

Section titled “Upgrade Steps”

1. Read the Migration Guide

Section titled “1. Read the Migration Guide”
Terminal window
# Every major release has an upgrade guide
# https://nextjs.org/docs/app/building-your-application/upgrading

2. Check for Deprecations

Section titled “2. Check for Deprecations”
Terminal window
# Run the build to see deprecation warnings
npm run build


# Check for deprecated APIs in your code

3. Update the Package

Section titled “3. Update the Package”
Terminal window
# Install the latest version
npm install next@latest


# Update related packages (react, react-dom)
npm install react@latest react-dom@latest

4. Resolve Breaking Changes

Section titled “4. Resolve Breaking Changes”

Common breaking changes include:

  • API changes (e.g., getServerSideProps → Server Components)
  • Configuration changes (next.config.js options)
  • Dependency updates (Node.js version requirements)
  • Image component changes

5. Test Thoroughly

Section titled “5. Test Thoroughly”
Terminal window
# Build and check for errors
npm run build


# Run tests
npm test


# Start production server and check manually
npm start

Upgrade Checklist

Section titled “Upgrade Checklist”
  • Read the official migration guide
  • Check Node.js version requirements
  • Update next and related packages
  • Resolve any TypeScript errors
  • Run the full test suite
  • Test in a preview deployment
  • Monitor after production deployment

Common Mistakes

Section titled “Common Mistakes”
  • Skipping versions — Upgrade one major version at a time. Skipping versions (e.g., 12 → 14) makes migration much harder.
  • Not checking the changelog — Each major version has specific breaking changes. Read the migration guide.
  • Upgrading before testing — Always test the upgrade in a development or preview environment first.

Best Practices

Section titled “Best Practices”
  • Upgrade one major version at a time (e.g., 13 → 14, not 12 → 14)
  • Read the official migration guide for each version
  • Run the full test suite after upgrading
  • Test in a preview deployment before production
  • Update react and react-dom at the same time

Summary

Section titled “Summary”

Upgrading Next.js requires planning. Read the migration guide, upgrade one major version at a time, and test thoroughly. Use preview deployments to verify before deploying to production.

Section titled “Related Topics”