$ sudo gem update
Password:
Updating installed gems...
Bulk updating Gem source index for: http://gems.rubyforge.org
Attempting remote update of actionmailer
Install required dependency actionpack? [Yn]  
Install required dependency activesupport? [Yn]  
Successfully installed actionmailer-2.0.2
Successfully installed actionpack-2.0.2
Successfully installed activesupport-2.0.2
Installing ri documentation for actionmailer-2.0.2...
Installing ri documentation for actionpack-2.0.2...
Installing ri documentation for activesupport-2.0.2...
Installing RDoc documentation for actionmailer-2.0.2...
Installing RDoc documentation for actionpack-2.0.2...
Installing RDoc documentation for activesupport-2.0.2...
Attempting remote update of actionpack
Successfully installed actionpack-2.0.2
Installing ri documentation for actionpack-2.0.2...
While generating documentation for actionpack-2.0.2
... MESSAGE:   Unhandled special: Special: type=33, text="TODO"
... RDOC args: --ri --op /usr/local/lib/ruby/gems/1.8/doc/actionpack-2.0.2/ri --quiet lib
(continuing with the rest of the installation)
Installing RDoc documentation for actionpack-2.0.2...
Attempting remote update of actionwebservice
Install required dependency actionpack? [Yn]