Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^9.5.0 || ^10.0 || ^11.0 || ^12.0 -> satisfiable by phpunit/phpunit[12.0.0, ..., 12.1.x-dev]. - phpunit/phpunit[12.0.1, ..., 12.1.x-dev] require php >=8.3 -> your php version (8.2.27) does not satisfy that requirement.