Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires symfony/config ^7.2.3 -> satisfiable by symfony/config[v7.2.3]. - symfony/config v7.2.3 requires php >=8.2 -> your php version (8.0.99; overridden via config.platform, actual: 8.4.3) does not satisfy that requirement. Problem 2 - Root composer.json requires behat/behat ^3.14.0 -> satisfiable by behat/behat[v3.14.0, ..., v3.18.1]. - behat/behat[v3.14.0, ..., v3.15.0] require symfony/config ^4.4 || ^5.0 || ^6.0 || ^7.0 -> satisfiable by symfony/config[v7.2.3]. - behat/behat[v3.16.0, ..., v3.18.1] require php 8.1.* || 8.2.* || 8.3.* || 8.4.* -> your php version (8.0.99; overridden via config.platform, actual: 8.4.3) does not satisfy that requirement. - symfony/config v7.2.3 requires php >=8.2 -> your php version (8.0.99; overridden via config.platform, actual: 8.4.3) does not satisfy that requirement. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.