# File lib/rubygems/commands/update_command.rb, line 234
def update_rubygems
check_update_arguments
version, requirement = rubygems_target_version
check_latest_rubygems version
update_gem 'rubygems-update', version
installed_gems = Gem::Specification.find_all_by_name 'rubygems-update', requirement
version = installed_gems.first.version
install_rubygems version
end