Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^11.5 -> satisfiable by phpunit/phpunit[11.5.0, ..., 11.5.x-dev]. - phpunit/phpunit[11.5.0, ..., 11.5.x-dev] require php >=8.2 -> your php version (8.1.32) does not satisfy that requirement.