Your requirements could not be resolved to an installable set of packages. Problem 1 - laravel/pulse[v1.0.0-beta1, ..., v1.0.0-beta11] require nesbot/carbon ^2.67 -> found nesbot/carbon[2.67.0, ..., 2.x-dev] but it conflicts with your root composer.json require (2.63). - laravel/pulse[v1.0.0-beta12, ..., v1.2.1] require nesbot/carbon ^2.67|^3.0 -> found nesbot/carbon[dev-master, 2.67.0, ..., 2.x-dev, 3.0.0-beta.1, ..., 3.x-dev (alias of dev-master)] but it conflicts with your root composer.json require (2.63). - Root composer.json requires laravel/pulse ^1.0@beta -> satisfiable by laravel/pulse[v1.0.0-beta1, ..., v1.2.1].