Your requirements could not be resolved to an installable set of packages. Problem 1 - phpunit/phpunit[10.0.0, ..., 10.5.x-dev] require php >=8.1 -> your php version (7.4.6; overridden via config.platform, actual: 7.3.33) does not satisfy that requirement. - Root composer.json requires phpunit/phpunit ^10.0 -> satisfiable by phpunit/phpunit[10.0.0, ..., 10.5.x-dev].