next-upgrade

Upgrades a Next.js project to a newer version by reading the current package.json, fetching the official migration guides, running the appropriate codemods, and updating dependencies. Handles incremental upgrades across major versions and flags any manual changes required by breaking API or config changes. Instead of manually cross-referencing multiple version-specific migration docs and running codemods in the right order, this skill fetches the relevant guides and handles the sequencing for you.