Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires ekino/phpstan-banned-code ^2.1 -> satisfiable by ekino/phpstan-banned-code[v2.1.0]. - ekino/phpstan-banned-code v2.1.0 requires phpstan/phpstan ^1.0 -> found phpstan/phpstan[1.0.0, ..., 1.12.9] but it conflicts with your root composer.json require (^2.0.0).