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). Problem 2 - Root composer.json requires symfony/framework-bundle ^4.4 || ^5.4 || ^6.0 -> satisfiable by symfony/framework-bundle[v4.4.0-BETA1, ..., 4.4.x-dev, v5.4.0-BETA1, ..., 5.4.x-dev, v6.0.0-BETA1, ..., 6.4.x-dev]. - symfony/framework-bundle[v4.4.0-BETA1, ..., v4.4.22] require symfony/config ^4.3.4|^5.0 -> found symfony/config[v4.3.4, ..., 4.4.x-dev, v5.0.0-BETA1, ..., 5.4.x-dev] but it conflicts with your root composer.json require (~7.0.0@dev). - symfony/framework-bundle[v4.4.24, ..., 4.4.x-dev] require symfony/config ^4.4.11|~5.0.11|^5.1.3 -> found symfony/config[v4.4.11, ..., 4.4.x-dev, v5.0.11, ..., 5.4.x-dev] but it conflicts with your root composer.json require (~7.0.0@dev). - symfony/framework-bundle[v5.4.0-BETA1, ..., 5.4.x-dev] require symfony/config ^5.3|^6.0 -> found symfony/config[v5.3.0-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). - symfony/framework-bundle[v6.0.0-BETA1, ..., v6.1.0-RC1] require symfony/config ^5.4|^6.0 -> found symfony/config[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). - symfony/framework-bundle[v6.1.0, ..., 6.3.x-dev] require symfony/config ^6.1 -> found symfony/config[v6.1.0-BETA1, ..., 6.4.x-dev] but it conflicts with your root composer.json require (~7.0.0@dev). - symfony/framework-bundle[v6.4.0-BETA1, ..., 6.4.x-dev] require symfony/http-kernel ^6.4 -> found symfony/http-kernel[v6.4.0-BETA1, ..., 6.4.x-dev] but it conflicts with your root composer.json require (~7.0.0@dev).