Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpcsstandards/php_codesniffer ^3.8.0, found phpcsstandards/php_codesniffer[dev-master, 3.x-dev (alias of dev-master)] but it does not match your minimum-stability. Problem 2 - Root composer.json requires phpcsstandards/phpcsutils ^1.0.9, found phpcsstandards/phpcsutils[dev-stable, dev-develop, 1.x-dev (alias of dev-stable)] but it does not match your minimum-stability.