Reads your codebase, applies the official migration codemods in sequence, flags breaking changes, and surfaces the code that needs manual attention before deploy.
Best for: Engineers managing a Next.js app who want to stay current without a rewrite.
Creator's repository · vercel-labs/next-skills
---
name: next-upgrade
description: Upgrade Next.js to the latest version following official migration guides and codemods
argument-hint: "[target-version]"
---
# Upgrade Next.js
Upgrade the current project to the latest Next.js version following official migration guides.
## Instructions
1. **Detect current version**: Read `package.json` to identify the current Next.js version and related dependencies (React, React DOM, etc.)
2. **Fetch the latest upgrade guide**: Use WebFetch to get the official upgrade documentation:
- Codemods: https://nextjs.org/docs/app/guides/upgrading/codemods
- Version-specific guides (adjust version as needed):
- https://nextjs.org/docs/app/guides/upgrading/version-16
- https://nextjs.org/docs/app/guides/upgrading/version-15
- https://nextjs.org/docs/app/guides/upgrading/version-14
3. **Determine upgrade path**: Based on current version, identify which migration steps apply. For major version jumps, upgrade incrementally (e.g., 13 → 14 → 15).
4. **Run codemods first**: Next.js provides codemods to automate breaking changes:
```bash
npx @next/codemod@latest <transform> <path>
```
Common transforms:
- `next-async-request-api` - Updates async Request APIs (v15)
- `next-request-geo-ip` - Migrates geo/ip properties (v15)
- `next-dynamic-access-named-export` - Transforms dynamic imports (v15)
5. **Update dependencies**: Upgrade Next.js and peer dependencies together:
```bash
npm install next@latest react@latest react-dom@latest
```
6. **Review breaking changes**: Check the upgrade guide for manual changes needed:
- API changes (e.g., async params in v15)
- Configuration changes in `next.config.js`
- Deprecated features being removed
7. **Update TypeScript types** (if applicable):
```bash
npm install @types/react@latest @types/react-dom@latest
```
8. **Test the upgrade**:
- Run `npm run build` to check for build errors
- Run `npm run dev` and test key functionality