Release 1.2.0 adds new features and fixes some bugs.

New features:

* RubyGems no longer performs bulk updates and instead only fetches the gemspec
files it needs. Alternate sources will need to upgrade to RubyGems 1.2 to
allow RubyGems to take advantage of the new metadata updater. If a pre 1.2
remote source is in the sources list, RubyGems will revert to the bulk update
code for compatibility.
* RubyGems now has runtime and development dependency types. Use
#add_development_dependency and #add_runtime_dependency. All typeless
dependencies are considered to be runtime dependencies.
* RubyGems will now require rubygems/defaults/operating_system.rb and
rubygems/defaults/#{RBX_ENGINE}.rb if they exist. This allows packagers and
ruby implementers to add custom behavior to RubyGems via these files. (If
the RubyGems API is insufficient, please suggest improvements via the
RubyGems list.)
* /etc/gemrc (and windows equivalent) for global settings
* setup.rb now handles --vendor and --destdir for packagers
* `gem stale` command that lists gems by last access time
Consiglio vivamente l'aggiornamento.
Non ho riscontrato alcun problema di compatibilità con release 1.x precedenti.

Per aggiornare

codice:
gem update --system