Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires nunomaduro/larastan ^2.5 -> satisfiable by nunomaduro/larastan[2.5.0, ..., 2.x-dev]. - Root composer.json requires phpstan/phpstan-mockery ^2.0 -> satisfiable by phpstan/phpstan-mockery[2.0.0, 2.0.x-dev]. - nunomaduro/larastan[2.5.0, ..., 2.5.1] require phpstan/phpstan ~1.10.3 -> satisfiable by phpstan/phpstan[1.10.3, ..., 1.10.x-dev]. - nunomaduro/larastan[2.5.2, ..., v2.6.4] require phpstan/phpstan ~1.10.6 -> satisfiable by phpstan/phpstan[1.10.6, ..., 1.10.x-dev]. - nunomaduro/larastan[v2.6.5, ..., v2.7.0] require phpstan/phpstan ^1.10.41 -> satisfiable by phpstan/phpstan[1.10.41, ..., 1.12.x-dev]. - nunomaduro/larastan[v2.9.9, ..., v2.9.11] require phpstan/phpstan ^1.12.5 -> satisfiable by phpstan/phpstan[1.12.5, ..., 1.12.x-dev]. - nunomaduro/larastan[v2.9.12, ..., v2.9.13] require phpstan/phpstan ^1.12.11 -> satisfiable by phpstan/phpstan[1.12.11, ..., 1.12.x-dev]. - nunomaduro/larastan[v2.9.14, ..., 2.x-dev] require phpstan/phpstan ^1.12.17 -> satisfiable by phpstan/phpstan[1.12.17, 1.12.18, 1.12.x-dev]. - nunomaduro/larastan[v2.8.0, ..., v2.9.2] require phpstan/phpstan ^1.10.50 -> satisfiable by phpstan/phpstan[1.10.50, ..., 1.12.x-dev]. - nunomaduro/larastan[v2.9.3, ..., v2.9.6] require phpstan/phpstan ^1.10.66 -> satisfiable by phpstan/phpstan[1.10.66, ..., 1.12.x-dev]. - nunomaduro/larastan v2.9.7 requires phpstan/phpstan ^1.11.1 -> satisfiable by phpstan/phpstan[1.11.1, ..., 1.12.x-dev]. - nunomaduro/larastan v2.9.8 requires phpstan/phpstan ^1.11.2 -> satisfiable by phpstan/phpstan[1.11.2, ..., 1.12.x-dev]. - phpstan/phpstan-mockery[2.0.0, ..., 2.0.x-dev] require phpstan/phpstan ^2.0 -> satisfiable by phpstan/phpstan[2.0.0, ..., 2.1.x-dev]. - You can only install one version of a package, so only one of these can be installed: phpstan/phpstan[1.10.56, ..., 1.12.x-dev, 2.1.3, 2.1.4, 2.1.5, 2.1.x-dev].