Bundler could not find compatible versions for gem "sprockets-rails": In Gemfile: sass-rails (>= 0) ruby depends on sprockets-rails (~> 2.0) ruby rails (>= 0) ruby depends on sprockets-rails (3.0.0.beta1) Need new gemspec for sprockets >= 2.8 need fix for commit https://github.com/rails/sprockets-rails/commit/40cd1d4c1966e8920242a8786f834e425ecacbbb