Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires dnadesign/silverstripe-elemental-userforms 6.x-dev (exact version match), found dnadesign/silverstripe-elemental-userforms[dev-master, 1.0.0-beta1, ..., 1.x-dev, 2.0.0-beta1, 2.0.0, 2.0.x-dev, 3.0.0-beta1, ..., 3.x-dev, 4.0.0-beta1, ..., 4.x-dev, 5.x-dev] but it does not match the constraint. Problem 2 - Root composer.json requires silverstripe/userforms 7.x-dev -> satisfiable by silverstripe/userforms[7.x-dev]. - silverstripe/userforms 7.x-dev requires silverstripe/segment-field ^4 -> found silverstripe/segment-field[4.x-dev] but it conflicts with your root composer.json require (3.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 silverstripe/blog 5.x-dev -> satisfiable by silverstripe/blog[5.x-dev]. - Root composer.json requires silverstripe/segment-field 3.x-dev -> satisfiable by silverstripe/segment-field[3.x-dev]. - silverstripe/blog 5.x-dev requires silverstripe/cms ^6 -> satisfiable by silverstripe/cms[6.x-dev]. - silverstripe/cms[5.0.0-beta1, ..., 5.x-dev] require silverstripe/versioned-admin ^2 -> satisfiable by silverstripe/versioned-admin[2.0.0-alpha1, ..., 2.x-dev]. - silverstripe/segment-field 3.x-dev requires silverstripe/cms ^5 -> satisfiable by silverstripe/cms[5.0.0-alpha1, ..., 5.x-dev]. - silverstripe/versioned-admin[2.0.0-alpha1, ..., 2.x-dev] require silverstripe/graphql ^5 -> found silverstripe/graphql[5.0.0-alpha1, ..., 5.x-dev] but it conflicts with your root composer.json require (6.x-dev). - You can only install one version of a package, so only one of these can be installed: silverstripe/cms[4.7.0-beta1, ..., 4.x-dev, 5.0.0-alpha1, ..., 5.x-dev, 6.x-dev].