Your requirements could not be resolved to an installable set of packages. Problem 1 - phpstan/phpstan[1.2.0, ..., 1.4.10] require php ^7.1|^8.0 -> your php version (7.0.33) does not satisfy that requirement. - phpstan/phpstan[1.5.0, ..., 1.10.50] require php ^7.2|^8.0 -> your php version (7.0.33) does not satisfy that requirement. - Root composer.json requires phpstan/phpstan ^1.2 -> satisfiable by phpstan/phpstan[1.2.0, ..., 1.10.50].