Why is bundle update taking so long? - ruby-on-rails-3

Question

I am upgrading my Rails app to use Ruby 2.1 and am updating my gems. However, when I run bundle update it is taking an incredibly long time to complete (3+ hours on the last run).
Any suggestions for fixing this would be greatly appreciated.
Here is my current gemfile:
source 'http://rubygems.org'
gem 'rails', '~> 3.2.11'
gem 'mysql2', '~>0.3.10'
gem 'json', '1.7.7'
gem 'will_paginate', '~> 3.0'
gem 'carrierwave'
gem "fog", "~> 1.3.1"
gem 'gibbon'
gem 'nokogiri'
gem 'premailer-rails3'
gem 'pg'
gem 'aws-s3'
gem 'amazon-ec2'
# Use unicorn as the app server
gem 'unicorn'
gem 'sidekiq'
gem 'rufus-scheduler'
gem 'exception_notification'
gem 'haml', '>= 4.0.0.rc.1'
gem 'html2haml'
gem 'state_machine'
gem 'garb', :git => 'git://github.com/Sija/garb.git'
gem "activerecord-import", ">= 0.2.0"
gem "hashie"
gem 'draper', '~> 1.0'
gem 'dotenv-rails', :groups => [:development, :test]
gem 'airbrake'
gem 'newrelic_rpm'
gem 'devise', '~> 2.2.4'
gem 'acts_as_tenant', :git => 'git://github.com/ErwinM/acts_as_tenant.git'
gem 'bourbon'
gem 'sass'
gem 'neat'
gem 'bitters'
gem 'middleman'
group :assets do
gem 'sass-rails', '~> 3.2.3'
gem 'coffee-rails', '~> 3.2.1'
gem 'handlebars_assets', :git => 'git://github.com/leshill/handlebars_assets.git'
gem 'jquery-rails', '~> 2.0.1'
gem 'uglifier', '>= 1.0.3'
end
group :test do
#gem 'webmock'
gem 'vcr'
gem 'launchy'
gem 'database_cleaner'
gem 'capybara', '2.0.0'
gem 'shoulda'
end
group :development, :test do
gem 'faker'
gem "rspec-rails", "2.14.0"
gem "factory_girl_rails", "~> 4.0", :require => false
gem 'spork', '~> 1.0rc'
gem 'guard-livereload'
gem 'guard-jasmine'
gem 'guard-spork'
gem 'guard-rspec'
gem 'jasminerice', :git => 'git://github.com/bradphelan/jasminerice.git'
end
group :development do
gem 'rb-inotify', :require => false
gem 'rb-fsevent', :require => false
gem 'rb-fchange', :require => false
gem 'pry'
end
Here is the last result I received:
Bundler could not find compatible versions for gem "thor":
In Gemfile:
rails (~> 3.2.11) ruby depends on
railties (= 3.2.11) ruby depends on
thor (< 2.0, >= 0.14.6) ruby
jquery-rails (~> 2.0.1) ruby depends on
thor (0.14.0)

Answer 1

You're including gems with incompatible dependencies. You cannot have both jquery-rails ~> 2.0.1 and rails ~> 3.2.11 as they have mutually exclusive requirements for versions of the Thor gem.
I would recommend removing the explicit version requirement for jquery-rails let Rails choose the version it needs based on its dependencies.