Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires rector/rector ^1.2 -> satisfiable by rector/rector[1.2.0, ..., 1.2.10]. - rector/rector[1.2.6, ..., 1.2.10] require phpstan/phpstan ^1.12.5 -> found phpstan/phpstan[1.12.5, ..., 1.12.12] but it conflicts with your root composer.json require (^2.0). - rector/rector[1.2.0, ..., 1.2.2] require phpstan/phpstan ^1.11 -> found phpstan/phpstan[1.11.0, ..., 1.12.12] but it conflicts with your root composer.json require (^2.0). - rector/rector 1.2.3 requires phpstan/phpstan ^1.11.9 -> found phpstan/phpstan[1.11.9, ..., 1.12.12] but it conflicts with your root composer.json require (^2.0). - rector/rector 1.2.4 requires phpstan/phpstan ^1.11.11 -> found phpstan/phpstan[1.11.11, ..., 1.12.12] but it conflicts with your root composer.json require (^2.0). - rector/rector 1.2.5 requires phpstan/phpstan ^1.12.2 -> found phpstan/phpstan[1.12.2, ..., 1.12.12] but it conflicts with your root composer.json require (^2.0).