Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires rollerscapes/standards ^1.0 -> satisfiable by rollerscapes/standards[1.0.x-dev (alias of dev-main)]. - rollerscapes/standards dev-main requires phpstan/phpstan ^2.1 -> found phpstan/phpstan[2.1.0, ..., 2.1.x-dev] but it conflicts with your root composer.json require (^1.10.39). - rollerscapes/standards 1.0.x-dev is an alias of rollerscapes/standards dev-main and thus requires it to be installed too.