Your requirements could not be resolved to an installable set of packages. Problem 1 - phpcompatibility/php-compatibility dev-develop requires phpcsstandards/phpcsutils ^1.0.5 -> satisfiable by phpcsstandards/phpcsutils[dev-stable, dev-develop, 1.0.5, ..., 1.x-dev (alias of dev-stable)] from composer repo (https://repo.packagist.org) but phpcsstandards/phpcsutils is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance. - phpcsstandards/php_codesniffer 3.x-dev is an alias of phpcsstandards/php_codesniffer dev-master and thus requires it to be installed too. - phpcompatibility/php-compatibility[9.0.0, ..., 9.3.5] conflict with squizlabs/php_codesniffer 2.6.2 (phpcsstandards/php_codesniffer 4.0.x-dev replaces squizlabs/php_codesniffer > 2.0). - 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). - 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, 10.x-dev (alias of dev-develop)]. - phpcompatibility/php-compatibility 10.x-dev is an alias of phpcompatibility/php-compatibility dev-develop and thus requires it to be installed too. - Root composer.json requires phpcsstandards/phpcsdevcs ^1.1.6 -> satisfiable by phpcsstandards/phpcsdevcs[1.1.6]. - Root composer.json requires phpcsstandards/php_codesniffer ^3.8.0 || 4.0.x-dev@dev -> satisfiable by phpcsstandards/php_codesniffer[3.x-dev (alias of dev-master), 4.0.x-dev].

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