Your requirements could not be resolved to an installable set of packages. Problem 1 - nette/php-generator[v3.6.0, ..., v3.6.7] require php >=7.2 <8.2 -> your php version (8.3.9) does not satisfy that requirement. - nette/php-generator[v3.6.8, ..., v3.6.9] require php >=7.2 <8.3 -> your php version (8.3.9) does not satisfy that requirement. - flightphp/runway v0.2.3 requires nette/php-generator ^3.6 -> satisfiable by nette/php-generator[v3.6.0, ..., v3.6.9]. - Root composer.json requires flightphp/runway ^0.2.3 -> satisfiable by flightphp/runway[v0.2.3].