Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires silverstripe/blog 4.x-dev -> satisfiable by silverstripe/blog[4.x-dev]. - silverstripe/blog 4.x-dev requires silverstripe/lumberjack ^3.0 -> found silverstripe/lumberjack[3.0.0-beta1, ..., 3.x-dev] but it conflicts with your root composer.json require (4.x-dev). Problem 2 - Root composer.json requires silverstripe/userforms 6.x-dev -> satisfiable by silverstripe/userforms[6.x-dev]. - silverstripe/userforms 6.x-dev requires symbiote/silverstripe-gridfieldextensions ^4 -> found symbiote/silverstripe-gridfieldextensions[4.0.0-alpha1, ..., 4.x-dev] but it conflicts with your root composer.json require (5.x-dev). Problem 3 - Root composer.json requires dnadesign/silverstripe-elemental 4.x-dev -> satisfiable by dnadesign/silverstripe-elemental[4.x-dev]. - dnadesign/silverstripe-elemental 4.x-dev requires symbiote/silverstripe-gridfieldextensions ^3.1 -> found symbiote/silverstripe-gridfieldextensions[3.1.0, ..., 3.x-dev] but it conflicts with your root composer.json require (5.x-dev). Problem 4 - Root composer.json requires dnadesign/silverstripe-elemental-userforms 5.x-dev -> satisfiable by dnadesign/silverstripe-elemental-userforms[5.x-dev]. - dnadesign/silverstripe-elemental-userforms 5.x-dev requires dnadesign/silverstripe-elemental ^6 -> found dnadesign/silverstripe-elemental[6.x-dev] but it conflicts with your root composer.json require (4.x-dev). Problem 5 - Root composer.json requires silverstripe/auditor 4.x-dev -> satisfiable by silverstripe/auditor[4.x-dev]. - Root composer.json requires silverstripe/contentreview 5.x-dev -> satisfiable by silverstripe/contentreview[5.x-dev]. - silverstripe/auditor 4.x-dev requires silverstripe/framework ^6 -> satisfiable by silverstripe/framework[6.x-dev]. - silverstripe/contentreview 5.x-dev requires silverstripe/framework ^5.4 -> satisfiable by silverstripe/framework[5.x-dev]. - You can only install one version of a package, so only one of these can be installed: silverstripe/framework[3.5.0-rc1, ..., 3.x-dev, 4.0.0-alpha1, ..., 4.x-dev, 5.0.0-alpha1, ..., 5.x-dev, 6.x-dev].