Your requirements could not be resolved to an installable set of packages. Problem 1 - 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. Problem 2 - Root composer.json requires phpcsstandards/php_codesniffer dev-master -> satisfiable by phpcsstandards/php_codesniffer[dev-master]. - phpcsstandards/phpcsdevcs 1.1.6 requires phpcompatibility/php-compatibility ^9.0.0 || ^10.0.0 -> satisfiable by phpcompatibility/php-compatibility[9.0.0, ..., 9.3.5]. - phpcompatibility/php-compatibility[9.0.0, ..., 9.3.5] conflict with squizlabs/php_codesniffer 2.6.2 (phpcsstandards/php_codesniffer dev-master replaces squizlabs/php_codesniffer > 2.0). - Root composer.json requires phpcsstandards/phpcsdevcs ^1.1.6 -> satisfiable by phpcsstandards/phpcsdevcs[1.1.6].