Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpstan/phpstan 2.0.3 -> satisfiable by phpstan/phpstan[2.0.3]. - phpstan/phpstan 2.0.3 requires php ^7.4|^8.0 -> your php version (7.3.33) does not satisfy that requirement. Problem 2 - Root composer.json requires phpstan/phpstan-phpunit 2.0.1 -> satisfiable by phpstan/phpstan-phpunit[2.0.1]. - phpstan/phpstan-phpunit 2.0.1 requires php ^7.4 || ^8.0 -> your php version (7.3.33) does not satisfy that requirement. Problem 3 - Root composer.json requires phpstan/phpstan-strict-rules 2.0.0 -> satisfiable by phpstan/phpstan-strict-rules[2.0.0]. - phpstan/phpstan-strict-rules 2.0.0 requires php ^7.4 || ^8.0 -> your php version (7.3.33) does not satisfy that requirement. Problem 4 - Root composer.json requires rector/rector 2.0.0 -> satisfiable by rector/rector[2.0.0]. - rector/rector 2.0.0 requires php ^7.4|^8.0 -> your php version (7.3.33) does not satisfy that requirement. Problem 5 - Root composer.json requires phpstan/extension-installer 1.4.3 -> satisfiable by phpstan/extension-installer[1.4.3]. - phpstan/extension-installer 1.4.3 requires phpstan/phpstan ^1.9.0 || ^2.0 -> satisfiable by phpstan/phpstan[2.0.3]. - phpstan/phpstan 2.0.3 requires php ^7.4|^8.0 -> your php version (7.3.33) does not satisfy that requirement.