Your requirements could not be resolved to an installable set of packages. Problem 1 - platine-php/framework dev-develop requires platine-php/cache 1.0.x-dev -> found platine-php/cache[dev-develop, 1.0.x-dev (alias of dev-develop)] but it does not match your minimum-stability. - platine-php/framework 1.0.x-dev is an alias of platine-php/framework dev-develop and thus requires it to be installed too. - Root composer.json requires platine-php/framework 1.0.x-dev -> satisfiable by platine-php/framework[1.0.x-dev (alias of dev-develop)].