Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^11.4 -> satisfiable by phpunit/phpunit[11.4.0, 11.4.1, 11.4.2, 11.4.3]. - phpunit/phpunit[11.4.0, ..., 11.4.3] require php >=8.2 -> your php version (8.1.30) does not satisfy that requirement.