Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^10.2 -> satisfiable by phpunit/phpunit[10.2.0, ..., 10.2.6]. - phpunit/phpunit[10.2.0, ..., 10.2.6] require php >=8.1 -> your php version (8.0.29) does not satisfy that requirement.