Rails Core will
not support 2.3.X, in any fashion, after 4.X is released. It is not relevant to their interests. It is very relevant to my interests, so watch for a coming announcement on my blog, or (an alternative) switch to Gthub's fork of 2.3.X.
Maintenance policy: https://groups.google.com/forum/m/?fromgroups#!topic/rubyonr...