Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires dynamic/silverstripe-elemental-baseobject dev-silverstripe6 -> satisfiable by dynamic/silverstripe-elemental-baseobject[dev-silverstripe6]. - dynamic/silverstripe-elemental-baseobject dev-silverstripe6 requires silvershop/silverstripe-hasonefield dev-silverstripe6 -> found silvershop/silverstripe-hasonefield[dev-dependabot/npm_and_yarn/fsevents-1.2.13, dev-dependabot/npm_and_yarn/browserify-sign-4.2.2, dev-main, 1.0.0, 1.x-dev, 2.0-alpha1, ..., 2.x-dev, 3.0.0, ..., 3.1.0, 4.0.0, 4.0.1, 4.x-dev (alias of dev-main)] but it does not match the constraint.