# File lib/bundler/bundle.rb, line 114
    def list_outdated(options={})
      outdated_gems = source_index.outdated.sort

      if outdated_gems.empty?
        Bundler.logger.info "All gems are up to date."
      else
        Bundler.logger.info "Outdated gems:"
        outdated_gems.each do |name|
          Bundler.logger.info " * #{name}"
        end
      end
    end