# wordpress-core-installer v4.0.0 released

**URL:** https://discourse.roots.io/t/wordpress-core-installer-v4-0-0-released/30249
**Category:** bedrock
**Tags:** releases
**Created:** 2026-03-22T03:22:08Z
**Posts:** 1

## Post 1 by @ben — 2026-03-22T03:22:08Z

[wordpress-core-installer v4.0.0 released](https://github.com/roots/wordpress-core-installer/releases/tag/v4.0.0)

## Breaking Changes

- **Composer 2 is now required** — Composer v1 reached EOL in October 2022 and is no longer supported. The `composer-plugin-api` and `composer/composer` constraints have been updated to `^2.0`.

## Improvements

- Cleaned up v1/v2 compatibility shims in tests
- Fixed PHPUnit deprecation warning (`expectExceptionMessageRegExp` → `expectExceptionMessageMatches`)

**Full Changelog** : [Comparing 3.0.0...v4.0.0 · roots/wordpress-core-installer · GitHub](https://github.com/roots/wordpress-core-installer/compare/3.0.0...v4.0.0)