Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires illuminate/container ^11.0 -> satisfiable by illuminate/container[v11.0.0, ..., v11.37.0]. - illuminate/container[v11.35.0, ..., v11.37.0] require php ^8.2 -> your php version (8.1.31) does not satisfy that requirement. Problem 2 - Root composer.json requires phpunit/phpunit ^11.4 -> satisfiable by phpunit/phpunit[11.4.0, ..., 11.5.2]. - phpunit/phpunit[11.4.0, ..., 11.5.2] require php >=8.2 -> your php version (8.1.31) does not satisfy that requirement.