Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires larastan/larastan ^2.8 -> satisfiable by larastan/larastan[v2.8.0, ..., 2.x-dev]. - larastan/larastan[v2.9.9, ..., 2.x-dev] require phpstan/phpstan ^1.12.5 -> found phpstan/phpstan[1.12.5, ..., 1.12.x-dev] but it conflicts with your root composer.json require (^2.0). - larastan/larastan[v2.8.0, ..., v2.9.2] require phpstan/phpstan ^1.10.50 -> found phpstan/phpstan[1.10.50, ..., 1.12.x-dev] but it conflicts with your root composer.json require (^2.0). - larastan/larastan[v2.9.3, ..., v2.9.6] require phpstan/phpstan ^1.10.66 -> found phpstan/phpstan[1.10.66, ..., 1.12.x-dev] but it conflicts with your root composer.json require (^2.0). - larastan/larastan v2.9.7 requires phpstan/phpstan ^1.11.1 -> found phpstan/phpstan[1.11.1, ..., 1.12.x-dev] but it conflicts with your root composer.json require (^2.0). - larastan/larastan v2.9.8 requires phpstan/phpstan ^1.11.2 -> found phpstan/phpstan[1.11.2, ..., 1.12.x-dev] but it conflicts with your root composer.json require (^2.0).