Your requirements could not be resolved to an installable set of packages.
Problem 1
- Root composer.json requires silverstripe/installer 6.0.x-dev -> satisfiable by silverstripe/installer[6.0.x-dev].
- silverstripe/installer 6.0.x-dev requires silverstripe/recipe-cms 6.0.x-dev -> satisfiable by silverstripe/recipe-cms[6.0.x-dev].
- silverstripe/recipe-cms 6.0.x-dev requires silverstripe/recipe-core 6.0.x-dev -> satisfiable by silverstripe/recipe-core[6.0.x-dev].
- silverstripe/recipe-core 6.0.x-dev requires silverstripe/framework 6.0.x-dev -> found silverstripe/framework[6.0.x-dev] but it conflicts with your root composer.json require (^6.1).