Your requirements could not be resolved to an installable set of packages. Problem 1 - symfony/config v6.4.0 requires php >=8.1 -> your php version (7.4.33) does not satisfy that requirement. - phpmd/phpmd 2.15.0 requires pdepend/pdepend ^2.16.1 -> satisfiable by pdepend/pdepend[2.16.1]. - pdepend/pdepend 2.16.1 requires symfony/config ^2.3.0|^3|^4|^5|^6.0|^7.0 -> satisfiable by symfony/config[v6.4.0]. - phpmd/phpmd is locked to version 2.15.0 and an update of this package was not requested.