Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires silverstripe/cms ^3 -> satisfiable by silverstripe/cms[3.0.2.1, ..., 3.x-dev]. - silverstripe/cms[3.0.3, ..., 3.0.x-dev] require silverstripe/framework 3.0.* -> found silverstripe/framework[3.0.2.1, ..., 3.0.x-dev] but it conflicts with your root composer.json require (^6). - silverstripe/cms 3.0.2.1 requires silverstripe/framework 3.0.2.1 -> found silverstripe/framework[3.0.2.1] but it conflicts with your root composer.json require (^6). - silverstripe/cms 3.0.3-rc1 requires silverstripe/framework 3.0.3-rc1 -> found silverstripe/framework[3.0.3-rc1] but it conflicts with your root composer.json require (^6). - silverstripe/cms 3.0.3-rc2 requires silverstripe/framework 3.0.3-rc2 -> found silverstripe/framework[3.0.3-rc2] but it conflicts with your root composer.json require (^6). - silverstripe/cms 3.1.0-beta1 requires silverstripe/framework 3.1.x-dev -> found silverstripe/framework[dev-revert-10291-pulls/4/revert, dev-pulls/fix-nbsp-test, dev-pulls/5/db-replica, 2.4.9, ..., 2.5.0, 3.0.2.1, ..., 3.x-dev, 4.0.0-alpha1, ..., 4.x-dev, 5.0.0-alpha1, ..., 5.x-dev, 6.x-dev] but it does not match the constraint. - silverstripe/cms[3.1.0-beta2, ..., 3.1.21] require silverstripe/framework 3.1.* -> found silverstripe/framework[3.1.0-beta1, ..., 3.1.21] but it conflicts with your root composer.json require (^6). - silverstripe/cms[3.2.0-beta1, ..., 3.2.6] require silverstripe/framework ~3.2 -> found silverstripe/framework[3.2.0-beta1, ..., 3.x-dev] but it conflicts with your root composer.json require (^6). - silverstripe/cms[3.3.0-beta1, ..., 3.3.4] require silverstripe/framework ~3.3 -> found silverstripe/framework[3.3.0-beta1, ..., 3.x-dev] but it conflicts with your root composer.json require (^6). - silverstripe/cms[3.4.0-rc1, ..., 3.x-dev] require silverstripe/framework ~3.4 -> found silverstripe/framework[3.4.0-rc1, ..., 3.x-dev] but it conflicts with your root composer.json require (^6).