Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires php ^8.3 but your php version (8.2.29) does not satisfy that requirement. Problem 2 - Root composer.json requires maglnet/composer-require-checker ^4.19 -> satisfiable by maglnet/composer-require-checker[4.19.0]. - maglnet/composer-require-checker 4.19.0 requires php ~8.3.0 || ~8.4.0 || ~8.5.0 -> your php version (8.2.29) does not satisfy that requirement. Problem 3 - Root composer.json requires phpunit/phpunit ^12.3 -> satisfiable by phpunit/phpunit[12.3.0, ..., 12.5.4]. - phpunit/phpunit[12.3.0, ..., 12.5.4] require php >=8.3 -> your php version (8.2.29) does not satisfy that requirement.