Your requirements could not be resolved to an installable set of packages. Problem 1 - phpunit/phpunit[10.3.0, ..., 10.3.5] require php >=8.1 -> your php version (8.0.30) does not satisfy that requirement. - Root composer.json requires phpunit/phpunit ^10.3 -> satisfiable by phpunit/phpunit[10.3.0, ..., 10.3.5].