Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires friendsofphp/php-cs-fixer 3.62.0 -> satisfiable by friendsofphp/php-cs-fixer[v3.62.0]. - friendsofphp/php-cs-fixer v3.62.0 requires php ^7.4 || ^8.0 -> your php version (7.3.33) does not satisfy that requirement.