[jstepien]

A 'point release' might be the phrase you are looking for.

[sirn]

Actually, Ruby used to follows the "unstable odd, stable even" versioning scheme but they seems to quit doing that since 1.9.1 (since both 1.9.1 and 1.9.2 are declared stable[1])

[1]: http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/...

EDIT: provide a source about Ruby 1.9.1

[cmer]

Good to know! I didn't realize 1.9.1 was considered stable.

[wmoxam]

Similarly, 1.8.7 is the stable version of the 1.8 series.