Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires azjezz/psl ^3.0 -> satisfiable by azjezz/psl[3.0.0, 3.0.1, 3.0.2]. - azjezz/psl[3.0.0, ..., 3.0.2] require php ~8.2.0 || ~8.3.0 -> your php version (8.4.0-dev) does not satisfy that requirement. Problem 2 - Root composer.json requires vimeo/psalm ^5.4 -> satisfiable by vimeo/psalm[5.4.0, ..., 5.26.1]. - vimeo/psalm[5.4.0, ..., 5.13.1] require php ^7.4 || ~8.0.0 || ~8.1.0 || ~8.2.0 -> your php version (8.4.0-dev) does not satisfy that requirement. - vimeo/psalm[5.14.0, ..., 5.26.1] require php ^7.4 || ~8.0.0 || ~8.1.0 || ~8.2.0 || ~8.3.0 -> your php version (8.4.0-dev) does not satisfy that requirement.