Your lock file does not contain a compatible set of packages. Please run composer update. Problem 1 - Root composer.json requires php ~8.4.2 but your php version (8.4.0RC1) does not satisfy that requirement. Problem 2 - roave/infection-static-analysis-plugin is locked to version 1.35.0 and an update of this package was not requested. - roave/infection-static-analysis-plugin 1.35.0 requires php ~8.1.0 || ~8.2.0 || ~8.3.0 -> your php version (8.4.0RC1) does not satisfy that requirement. Problem 3 - vimeo/psalm is locked to version 5.26.1 and an update of this package was not requested. - vimeo/psalm 5.26.1 requires php ^7.4 || ~8.0.0 || ~8.1.0 || ~8.2.0 || ~8.3.0 -> your php version (8.4.0RC1) does not satisfy that requirement. Problem 4 - vimeo/psalm 5.26.1 requires php ^7.4 || ~8.0.0 || ~8.1.0 || ~8.2.0 || ~8.3.0 -> your php version (8.4.0RC1) does not satisfy that requirement. - psalm/plugin-phpunit 0.19.0 requires vimeo/psalm dev-master || ^5@beta || ^5.0 -> satisfiable by vimeo/psalm[5.26.1]. - psalm/plugin-phpunit is locked to version 0.19.0 and an update of this package was not requested.