Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires php ^8.2 but your php version (8.1.33) does not satisfy that requirement. Problem 2 - Root composer.json requires phpunit/phpunit ^11.5 || ^12.3 -> satisfiable by phpunit/phpunit[11.5.0, ..., 11.5.34, 12.3.0, ..., 12.3.6]. - phpunit/phpunit[11.5.0, ..., 11.5.34] require php >=8.2 -> your php version (8.1.33) does not satisfy that requirement. - phpunit/phpunit[12.3.0, ..., 12.3.6] require php >=8.3 -> your php version (8.1.33) does not satisfy that requirement.