Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires doctrine/coding-standard ^13.0 -> satisfiable by doctrine/coding-standard[13.0.0, 13.0.1]. - doctrine/coding-standard[13.0.0, ..., 13.0.1] require squizlabs/php_codesniffer ^3.7 -> found squizlabs/php_codesniffer[3.7.0, ..., 3.13.4] but it conflicts with your root composer.json require (^4.0.0). Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.