[Rails] About Latest version of ROR

hi all,
  i have application developed in following ruby ,rails and gem version i want to upgrade it with latest version,can anyone tell what are
  stable version for ruby,rails and gem ? and also with compability for Ruby and Rails version with latest gem version ?
gem version:1.3.7
ruby version:ruby 1.8.7 (2011-02-18 patchlevel 334) [i386-mingw32]
rails version:Rails 1.1.6

thanks in advanced

Thanks and Regards
Sachin S. Kewale
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