appraise 'rails-3' do
  gem 'rails', '3.2.19'
  gem 'rack-cache', '<= 1.2'  # Pin as next rack-cache version (1.3) removes Ruby1.9 support
end

appraise 'rails-4' do
  gem 'rails', '4.1.6'
end

appraise 'rails-5' do
  gem 'rails', '5.0.0'
end

appraise 'rack-1.5.2' do
  gem 'rack', '1.5.2'
end