Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires symfony/yaml ^6.4 -> satisfiable by symfony/yaml[v6.4.0, v6.4.3]. - symfony/yaml[v6.4.0, ..., v6.4.3] require php >=8.1 -> your php version (8.0.30) does not satisfy that requirement. Problem 2 - consolidation/robo[4.0.0, ..., 4.0.6] require symfony/yaml ^6 -> satisfiable by symfony/yaml[v6.4.0, v6.4.3]. - consolidation/robo 4.0.2 requires symfony/yaml ^4.4 || ^5 || ^6 -> satisfiable by symfony/yaml[v6.4.0, v6.4.3]. - symfony/yaml[v6.4.0, ..., v6.4.3] require php >=8.1 -> your php version (8.0.30) does not satisfy that requirement. - Root composer.json requires consolidation/robo ^4 -> satisfiable by consolidation/robo[4.0.0, ..., 4.0.6].