Your requirements could not be resolved to an installable set of packages. Problem 1 - silverstripe/recipe-cms 5.0.x-dev requires silverstripe/graphql 5.0.x-dev -> found silverstripe/graphql[5.1.0-beta1] but it does not match the constraint. See https://getcomposer.org/dep-on-root for details and assistance. - silverstripe/recipe-cms 5.0.0-alpha1 requires silverstripe/graphql 5.0.0-alpha1 -> found silverstripe/graphql[5.1.0-beta1] but it does not match the constraint. See https://getcomposer.org/dep-on-root for details and assistance. - silverstripe/recipe-cms 5.0.0-beta1 requires silverstripe/graphql ~5.0.0@beta -> satisfiable by silverstripe/graphql[5.0.0-beta1, ..., 5.0.2] from composer repo (https://repo.packagist.org) but silverstripe/graphql is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance. - silverstripe/recipe-cms[5.0.0-rc1, ..., 5.0.0] require silverstripe/graphql ~5.0.0@stable -> satisfiable by silverstripe/graphql[5.0.0-beta1, ..., 5.0.2] from composer repo (https://repo.packagist.org) but silverstripe/graphql is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance. - silverstripe/installer 5.0.0-beta1 requires silverstripe/recipe-cms ~5.0.0@beta -> satisfiable by silverstripe/recipe-cms[5.0.0-alpha1, ..., 5.0.x-dev]. - Root composer.json requires silverstripe/installer 5.0.0-beta1 -> satisfiable by silverstripe/installer[5.0.0-beta1].