Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires ghostwriter/coding-standard dev-main -> satisfiable by ghostwriter/coding-standard[dev-main]. - ghostwriter/coding-standard dev-main requires ghostwriter/console ^0.1.2 -> satisfiable by ghostwriter/console[0.1.2]. - ghostwriter/console 0.1.2 requires ghostwriter/container ^6.0.1 -> found ghostwriter/container[6.0.1] but it conflicts with your root composer.json require (^5.0.1). Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.