Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires rapidez/core ^4.4, found rapidez/core[dev-feature/for-current-store-scope-multi-column, ..., dev-bugfix/broken-autocomplete-2.x, 0.1.0, ..., 0.x-dev, 1.0.0, ..., 1.x-dev, 2.0.0, ..., 2.x-dev, 3.0.0, ..., 3.x-dev, 4.0.0, ..., 4.3.0] but it does not match the constraint. Problem 2 - Root composer.json requires rapidez/account ^4.0 -> satisfiable by rapidez/account[4.0.0, 4.0.1]. - rapidez/account[4.0.0, ..., 4.0.1] require rapidez/core ^3.8|^4.0 -> found rapidez/core[3.8.0, ..., 3.x-dev, 4.0.0, ..., 4.3.0] but it conflicts with your root composer.json require (^4.4).