Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^10.5 -> satisfiable by phpunit/phpunit[10.5.0, ..., 10.5.24]. - phpunit/phpunit[10.5.0, ..., 10.5.24] require php >=8.1 -> your php version (8.0.30) does not satisfy that requirement.