# rvm > A tool for easily installing, managing, and working with multiple ruby environments. > More information: . - Install one or more space-separated versions of Ruby: `rvm install {{version(s)}}` - Display a list of installed versions: `rvm list` - Use a specific version of Ruby: `rvm use {{version}}` - Set the default Ruby version: `rvm --default use {{version}}` - Upgrade a version of Ruby to a new version: `rvm upgrade {{current_version}} {{new_version}}` - Uninstall a version of Ruby and keep its sources: `rvm uninstall {{version}}` - Remove a version of Ruby and its sources: `rvm remove {{version}}` - Show specific dependencies for your OS: `rvm requirements`