Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires dereuromark/cakephp-ide-helper dev-cake5 -> satisfiable by dereuromark/cakephp-ide-helper[dev-cake5]. - dereuromark/cakephp-ide-helper dev-cake5 requires cakephp/cakephp 5.x-dev -> found cakephp/cakephp[5.x-dev] but it does not match your minimum-stability.