Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires beste/php-cs-fixer-config ^3.1.1 -> satisfiable by beste/php-cs-fixer-config[3.1.1]. - beste/php-cs-fixer-config 3.1.1 requires php ~8.1.0 || ~8.2.0 || ~8.3.0 -> your php version (8.4.0-dev) does not satisfy that requirement.