###Emblem rails is unmaintained - at this point I'd extremely strongly recommend using ember-cli instead of ember-rails, and slightly less strongly recommend not using emblem, as although the syntax is great it's turned out to not keep up with developments in hbs very quickly and as such using hbs has been a lot easier overall in my experience

Integrate Emblem.js with ember-rails

Add gem 'emblem-rails' to your application's Gemfile after ember-rails:

gem 'ember-rails'
gem 'emblem-rails'

# If you are using Ember 1.9, you will currently need to specify the master branch of 
# emblem source, and a fork of barber-emblem:

gem "emblem-source", github: "machty/emblem.js"

And then execute:

$ bundle

Now any templates ending in .emblem will be compiled as Ember-Handlebars templates. If you need to compile your Emblem templates with vanilla Handlebars, use the .raw.emblem extension.

This gem is only responsible for integrating Emblem.js with Rails. Any updates to the Emblem language itself can be pulled in via

$ bundle update emblem-source