Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires ergebnis/phpstan-rules ^2.2.0 -> satisfiable by ergebnis/phpstan-rules[2.2.0]. - ergebnis/phpstan-rules 2.2.0 requires php ~8.1.0 || ~8.2.0 || ~8.3.0 -> your php version (8.4.0-dev) does not satisfy that requirement. Problem 2 - Root composer.json requires roave/backward-compatibility-check ^8.6.0 -> satisfiable by roave/backward-compatibility-check[8.6.0, ..., 8.10.0]. - roave/backward-compatibility-check[8.7.0, ..., 8.10.0] require php ~8.2.0 || ~8.3.0 -> your php version (8.4.0-dev) does not satisfy that requirement. - roave/backward-compatibility-check 8.6.0 requires php ~8.1.0 || ~8.2.0 || ~8.3.0 -> your php version (8.4.0-dev) does not satisfy that requirement.