PHPUnit 13 has been released with new features and breaking changes. It requires PHP 8.4 or later and introduces new array comparison assertions, refined mock object parameter matching, sealed test doubles for stricter configuration, and hard-deprecates the any() matcher. The release removes functionality that was hard-deprecated in PHPUnit 12. Developers should ensure their test suite runs cleanly on PHPUnit 12.5 without deprecation warnings before upgrading.
