Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires yoanm/symfony-jsonrpc-http-server-doc ^1.1 -> satisfiable by yoanm/symfony-jsonrpc-http-server-doc[v1.1.0, v1.1.1]. - yoanm/symfony-jsonrpc-http-server-doc[v1.1.0, ..., v1.1.1] require symfony/config ^4.4 || ^5.4 || ^6.0 -> found symfony/config[v4.4.0-BETA1, ..., 4.4.x-dev, v5.4.0-BETA1, ..., 5.4.x-dev, v6.0.0-BETA1, ..., 6.4.x-dev] but it conflicts with your root composer.json require (~7.0.0@dev).