Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires wp-coding-standards/wpcs ^3.3 -> satisfiable by wp-coding-standards/wpcs[3.3.0]. - wp-coding-standards/wpcs 3.3.0 requires squizlabs/php_codesniffer ^3.13.4 -> found squizlabs/php_codesniffer[3.13.4, 3.13.5] but it conflicts with your root composer.json require (^4.0). Problem 2 - Root composer.json requires phpcompatibility/phpcompatibility-wp ^2.1 -> satisfiable by phpcompatibility/phpcompatibility-wp[2.1.0, ..., 2.1.8]. - phpcompatibility/php-compatibility[9.0.0, ..., 9.3.5] require squizlabs/php_codesniffer ^2.3 || ^3.0.2 -> found squizlabs/php_codesniffer[2.3.0, ..., 2.9.2, 3.0.2, ..., 3.13.5] but it conflicts with your root composer.json require (^4.0). - phpcompatibility/phpcompatibility-wp[2.1.0, ..., 2.1.6] require phpcompatibility/php-compatibility ^9.0 -> satisfiable by phpcompatibility/php-compatibility[9.0.0, ..., 9.3.5]. - phpcompatibility/phpcompatibility-wp[2.1.7, ..., 2.1.8] require squizlabs/php_codesniffer ^3.3 -> found squizlabs/php_codesniffer[3.3.0, ..., 3.13.5] but it conflicts with your root composer.json require (^4.0).