Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires vimeo/psalm ^6.10 -> satisfiable by vimeo/psalm[6.10.0, 6.10.1]. - vimeo/psalm[6.10.0, ..., 6.10.1] require php ~8.1.31 || ~8.2.27 || ~8.3.16 || ~8.4.3 -> your php version (7.4.33) does not satisfy that requirement.