Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires boesing/psalm-plugin-stringf ^1.4 -> satisfiable by boesing/psalm-plugin-stringf[1.4.0]. - boesing/psalm-plugin-stringf 1.4.0 requires php ^7.4 || ~8.0.0 || ~8.1.0 || ~8.2.0 -> your php version (8.4.0RC1) does not satisfy that requirement. Problem 2 - laminas/laminas-stdlib 3.17.0 requires php ~8.1.0 || ~8.2.0 -> your php version (8.4.0RC1) does not satisfy that requirement. - laminas/laminas-stdlib[3.18.0, ..., 3.19.0] require php ~8.1.0 || ~8.2.0 || ~8.3.0 -> your php version (8.4.0RC1) does not satisfy that requirement. - Root composer.json requires laminas/laminas-stdlib ^3.17 -> satisfiable by laminas/laminas-stdlib[3.17.0, 3.18.0, 3.19.0].