Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires php ~8.3.0 || ~8.4.0 but your php version (7.4.33) does not satisfy that requirement. Problem 2 - Root composer.json requires rector/type-perfect ^2.1.2 -> satisfiable by rector/type-perfect[2.1.2]. - Root composer.json requires thecodingmachine/phpstan-safe-rule 1.2.0 || 1.4.1 -> satisfiable by thecodingmachine/phpstan-safe-rule[v1.2.0, v1.4.1]. - rector/type-perfect 2.1.2 requires phpstan/phpstan ^2.1.14 -> satisfiable by phpstan/phpstan[2.1.32]. - thecodingmachine/phpstan-safe-rule v1.2.0 requires phpstan/phpstan ^1.0 -> satisfiable by phpstan/phpstan[1.12.32]. - thecodingmachine/phpstan-safe-rule v1.4.1 requires php ^8.1 -> your php version (7.4.33) does not satisfy that requirement. - You can only install one version of a package, so only one of these can be installed: phpstan/phpstan[1.12.32, 2.1.32].