Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires nette/php-generator ^3.6 -> satisfiable by nette/php-generator[v3.6.0, ..., v3.6.9]. - nette/php-generator[v3.6.0, ..., v3.6.7] require php >=7.2 <8.2 -> your php version (8.4.3) does not satisfy that requirement. - nette/php-generator[v3.6.8, ..., v3.6.9] require php >=7.2 <8.3 -> your php version (8.4.3) does not satisfy that requirement.