Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires php >=8.1 but your php version (7.4.33) does not satisfy that requirement. Problem 2 - Root composer.json requires launchdarkly/server-sdk >=6.4.0 <7.0.0 -> satisfiable by launchdarkly/server-sdk[6.4.0]. - launchdarkly/server-sdk 6.4.0 requires php >=8.1 -> your php version (7.4.33) does not satisfy that requirement. Problem 3 - Root composer.json requires psr/log ^3.0 -> satisfiable by psr/log[3.0.0, 3.0.1, 3.0.2]. - psr/log[3.0.0, ..., 3.0.2] require php >=8.0.0 -> your php version (7.4.33) does not satisfy that requirement. Problem 4 - Root composer.json requires friendsofphp/php-cs-fixer ^3.68 -> satisfiable by friendsofphp/php-cs-fixer[v3.68.0, v3.68.1]. - composer/xdebug-handler[3.0.3, ..., 3.0.5] require psr/log ^1 || ^2 || ^3 -> satisfiable by psr/log[3.0.0, 3.0.1, 3.0.2]. - friendsofphp/php-cs-fixer[v3.68.0, ..., v3.68.1] require composer/xdebug-handler ^3.0.3 -> satisfiable by composer/xdebug-handler[3.0.3, 3.0.4, 3.0.5]. - psr/log[3.0.0, ..., 3.0.2] require php >=8.0.0 -> your php version (7.4.33) does not satisfy that requirement.