Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires flarum/core ^2.0.0, found flarum/core[dev-release/v1.6.2, dev-release/v1.6.3, dev-release/v1.7.2, dev-main-borked-with-split-conflicts, dev-main, dev-master, v0.1.0-beta, ..., v0.1.0-beta.16, v1.0.0, ..., 1.x-dev (alias of dev-master)] but it does not match the constraint. Problem 2 - Root composer.json requires fof/extend ^2.0.0, found fof/extend[dev-master, 0.1.0, 0.2.0, 0.3.0, 0.3.1, 1.0.0, ..., 1.3.3] but it does not match the constraint. Problem 3 - Root composer.json requires flarum/testing ^2.0.0, found flarum/testing[dev-main, dev-master, dev-as/rollback-extension-migrations-before-tests, dev-as/include-current-extension, dev-as/start-transaction-before-boot, v0.1.0-beta.1, v0.1.0-beta.16, v0.1.0-beta.16.1, v1.0.0, ..., 1.x-dev (alias of dev-master)] but it does not match the constraint. Problem 4 - Root composer.json requires flarum/pusher * -> satisfiable by flarum/pusher[v1.0.0, ..., v1.8.1]. - flarum/pusher v1.0.0 requires flarum/core ^1.0 -> found flarum/core[v1.0.0, ..., v1.8.9] but it conflicts with your root composer.json require (^2.0.0). - flarum/pusher v1.1.0 requires flarum/core ^1.1 -> found flarum/core[v1.1.0, ..., v1.8.9] but it conflicts with your root composer.json require (^2.0.0). - flarum/pusher v1.2.0 requires flarum/core ^1.2 -> found flarum/core[v1.2.0, ..., v1.8.9] but it conflicts with your root composer.json require (^2.0.0). - flarum/pusher v1.3.0 requires flarum/core ^1.3 -> found flarum/core[v1.3.0, ..., v1.8.9] but it conflicts with your root composer.json require (^2.0.0). - flarum/pusher v1.4.0 requires flarum/core ^1.4 -> found flarum/core[v1.4.0, ..., v1.8.9] but it conflicts with your root composer.json require (^2.0.0). - flarum/pusher v1.5.0 requires flarum/core ^1.5 -> found flarum/core[v1.5.0, ..., v1.8.9] but it conflicts with your root composer.json require (^2.0.0). - flarum/pusher[v1.6.0, ..., v1.6.1] require flarum/core ^1.6 -> found flarum/core[v1.6.0, ..., v1.8.9] but it conflicts with your root composer.json require (^2.0.0). - flarum/pusher v1.7.0 requires flarum/core ^1.7 -> found flarum/core[v1.7.0, ..., v1.8.9] but it conflicts with your root composer.json require (^2.0.0). - flarum/pusher[v1.8.0, ..., v1.8.1] require flarum/core ^1.8 -> found flarum/core[v1.8.0, ..., v1.8.9] but it conflicts with your root composer.json require (^2.0.0).