Which gem is breaking Rails application.css.scss wrong number of arguments 3 for 2

Question

Okay. This is a new problem caused by a gem update. Calling bundle update breaks my rails application. Here are the gems that changed:

# Gemfile.lock
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Answer 1

The problem is with sass. Here's a link to the the official issue.

Locking sass-rails to version 4.0.3 has worked for me on rails-4.0.x through rails-4.1.x. In your Gemfile:

gem 'sass-rails', '4.0.3'

UPDATE

A better solution I have found is to use the 4-0-stable branch:

gem 'sass-rails', github: 'rails/sass-rails', branch: '4-0-stable'