Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires symfony/config ^4.4 || ^5.4 || ^6.0 -> satisfiable by symfony/config[v6.4.0-BETA1, ..., 6.4.x-dev]. - symfony/config[v6.4.0-BETA1, ..., 6.4.x-dev] require php >=8.1 -> your php version (7.4.33) does not satisfy that requirement. Problem 2 - Root composer.json requires symfony/dependency-injection ^4.4 || ^5.4 || ^6.0 -> satisfiable by symfony/dependency-injection[v6.4.0-BETA1, ..., 6.4.x-dev]. - symfony/dependency-injection[v6.4.0-BETA1, ..., 6.4.x-dev] require php >=8.1 -> your php version (7.4.33) does not satisfy that requirement. Problem 3 - Root composer.json requires symfony/http-foundation ^4.4 || ^5.4 || ^6.0 -> satisfiable by symfony/http-foundation[v6.4.0-BETA1, ..., 6.4.x-dev]. - symfony/http-foundation[v6.4.0-BETA1, ..., 6.4.x-dev] require php >=8.1 -> your php version (7.4.33) does not satisfy that requirement. Problem 4 - Root composer.json requires symfony/http-kernel ^4.4 || ^5.4 || ^6.0 -> satisfiable by symfony/http-kernel[v6.4.0-BETA1, ..., 6.4.x-dev]. - symfony/http-kernel[v6.4.0-BETA1, ..., 6.4.x-dev] require php >=8.1 -> your php version (7.4.33) does not satisfy that requirement. Problem 5 - Root composer.json requires symfony/property-access ^4.4 || ^5.4 || ^6.0 -> satisfiable by symfony/property-access[v6.4.0-BETA1, v6.4.0-RC1, v6.4.0, 6.4.x-dev]. - symfony/property-access[v6.4.0-BETA1, ..., 6.4.x-dev] require php >=8.1 -> your php version (7.4.33) does not satisfy that requirement. Problem 6 - Root composer.json requires symfony/routing ^4.4 || ^5.4 || ^6.0 -> satisfiable by symfony/routing[v6.4.0-BETA1, ..., 6.4.x-dev]. - symfony/routing[v6.4.0-BETA1, ..., 6.4.x-dev] require php >=8.1 -> your php version (7.4.33) does not satisfy that requirement. Problem 7 - Root composer.json requires symfony/serializer ^4.4 || ^5.4 || ^6.0 -> satisfiable by symfony/serializer[v6.4.0-BETA1, ..., 6.4.x-dev]. - symfony/serializer[v6.4.0-BETA1, ..., 6.4.x-dev] require php >=8.1 -> your php version (7.4.33) does not satisfy that requirement. Problem 8 - Root composer.json requires symfony/twig-bridge ^4.4 || ^5.4 || ^6.0 -> satisfiable by symfony/twig-bridge[v6.4.0-BETA1, ..., 6.4.x-dev]. - symfony/twig-bridge[v6.4.0-BETA1, ..., 6.4.x-dev] require php >=8.1 -> your php version (7.4.33) does not satisfy that requirement. Problem 9 - Root composer.json requires symfony/translation ^4.4 || ^5.4 || ^6.0 -> satisfiable by symfony/translation[v6.4.0-BETA1, ..., 6.4.x-dev]. - symfony/translation[v6.4.0-BETA1, ..., 6.4.x-dev] require php >=8.1 -> your php version (7.4.33) does not satisfy that requirement. Problem 10 - symfony/config[v6.4.0-BETA1, ..., 6.4.x-dev] require php >=8.1 -> your php version (7.4.33) does not satisfy that requirement. - matthiasnoback/symfony-dependency-injection-test[4.3.0, ..., v4.3.1] require symfony/config ^4.4 || ^5.3 || ^6.0 -> satisfiable by symfony/config[v6.4.0-BETA1, ..., 6.4.x-dev]. - Root composer.json requires matthiasnoback/symfony-dependency-injection-test ^4.3 -> satisfiable by matthiasnoback/symfony-dependency-injection-test[4.3.0, v4.3.1].