Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires ramsey/devtools ^2.0 -> satisfiable by ramsey/devtools[2.0.0]. - ramsey/devtools 2.0.0 requires vimeo/psalm ^5.8 -> satisfiable by vimeo/psalm[5.8.0, ..., 5.x-dev]. - vimeo/psalm[5.8.0, ..., 5.13.1] require php ^7.4 || ~8.0.0 || ~8.1.0 || ~8.2.0 -> your php version (8.4.2) does not satisfy that requirement. - vimeo/psalm[5.14.0, ..., 5.x-dev] require php ^7.4 || ~8.0.0 || ~8.1.0 || ~8.2.0 || ~8.3.0 -> your php version (8.4.2) does not satisfy that requirement.