Esto es lo que me salta:
Código:
Gracias de antemano composer update Loading composer repositories with package information Updating dependencies (including require-dev) [RuntimeException] Could not load package monolog/monolog in http://packagist.org: [UnexpectedValueException] Could not parse version constraint >=0.90 <3.0: Invali d version string "0.90 <3.0" [UnexpectedValueException] Could not parse version constraint >=0.90 <3.0: Invalid version string "0.90 <3.0" update [--prefer-source] [--prefer-dist] [--dry-run] [--dev] [--no-dev] [--lock] [--no-plugins] [--no-custom-installers] [--no-scripts] [--no-progress ] [--with-dependencies] [-v|vv|vvv|--verbose] [-o|--optimize-autoloader] [packages1] ... [packagesN]