Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires php ^8.1 but your php version (8.0; overridden via config.platform, actual: 8.0.30) does not satisfy that requirement. Problem 2 - Root composer.json requires silverstripe/installer 5.x-dev -> satisfiable by silverstripe/installer[5.x-dev]. - silverstripe/installer 5.x-dev requires php ^8.1 -> your php version (8.0; overridden via config.platform, actual: 8.0.30) does not satisfy that requirement. Problem 3 - silverstripe/framework[5.1.0-beta1, ..., 5.x-dev] require php ^8.1 -> your php version (8.0; overridden via config.platform, actual: 8.0.30) does not satisfy that requirement. - Root composer.json requires silverstripe/framework ^5.1.0 -> satisfiable by silverstripe/framework[5.1.0-beta1, 5.1.0-rc1, 5.1.x-dev, 5.x-dev].