appraise 'activerecord-4-0' do
  gem 'activerecord', '~> 4.0', '>= 4.0.13'
end

appraise 'activerecord-4-1' do
  gem 'activerecord', '~> 4.1', '>= 4.1.15'
end

appraise 'activerecord-4-2' do
  gem 'activerecord', '~> 4.2', '>= 4.2.6'
end

appraise 'activerecord-5-0' do
  gem 'activerecord', '>= 5.0.0.beta3', '< 5.1'
end

appraise 'activerecord-head' do
  gem 'activerecord', github: 'rails/rails'
end