Ask Claude to Upgrade a Dependency and Fix Every Breaking Change Across Your Codebase
Upgrading a major dependency version means reading the changelog, understanding what broke, and hunting down every usage across your codebase that needs to change. Claude does the whole thing systematically.
> upgrade Laravel from 12 to 13 — read the upgrade guide, bump the
> version in composer.json, and fix every breaking change in our code
Claude bumps the version, runs the update, reads any error output, then searches your codebase for deprecated methods, renamed classes, changed configuration, and removed features — fixing each one according to the upgrade guide.
This works for any ecosystem:
> upgrade React from 18 to 19 — fix the new JSX transform,
> update any deprecated lifecycle methods, and switch to the
> new use() hook where applicable
> upgrade PHPUnit from 10 to 11 — update the config file,
> fix renamed assertions, and migrate deprecated test patterns
> upgrade Tailwind CSS from v3 to v4 — update the config format,
> fix any removed utility classes, and migrate to the new
> CSS-based configuration
Claude handles the tedious parts that make upgrades take days:
- Renamed methods — finds every call to the old name and updates it
- Changed signatures — updates argument order, new required params, removed defaults
- Removed features — replaces deprecated code with the recommended alternative
- Config changes — updates config file formats, moves keys, adds new required settings
- Import paths — fixes changed package paths and re-exports
After making changes, tell Claude to verify:
> run the tests and fix anything that broke from the upgrade
Claude runs your test suite, reads the failures, and fixes each one — iterating until the suite passes with the new version.
For especially large upgrades, combine with plan mode:
> /plan upgrade from Next.js 14 to 15 — list every breaking change
> that affects our codebase before making any modifications
Dependency upgrades are migration work, not creative work — let Claude handle the mechanical changes so you can focus on the ones that need judgment.
via Claude Code
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Set up Claude Code as an automated reviewer in your CI pipeline — on every pull request, it reads the diff, checks for bugs, security issues, missing tests, and convention violations, then posts its findings as a PR comment. Your human reviewers get a head start because the obvious issues are already flagged before they look.
Before deploying, tell Claude to read your project — migrations, environment variables, queue workers, scheduled tasks, caching, third-party integrations — and generate a deployment checklist that's specific to your app. Not a generic "did you run migrations?" list, but one that knows YOUR infrastructure and catches the things YOUR deploy can break.
Instead of writing a README from memory or copying a template, tell Claude to read your project and generate one that's actually accurate — real setup instructions from your config, real architecture from your directory structure, real API examples from your routes, and real prerequisites from your dependency files.