```ruby
# coding: utf-8
lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'ar_lookups/version'

Gem::Specification.new do |spec|
  spec.name          = "ar_lookups"
  spec.version       = ArLookups::VERSION
  spec.authors       = ["Stan Bondi"]
  spec.email         = ["stan@fixate.it"]
  spec.summary       = %q{Lookup tables using activerecord and array fields}
  spec.homepage      = "https://github.com/fixate/ar_ar_lookups"
  spec.license       = "MIT"

  spec.files         = Dir['lib/**/*', '[A-Z]*'] - ['Gemfile.lock']
  spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
  spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
  spec.require_paths = ["lib"]

  spec.add_dependency 'rails', '~> 4.0'

  spec.add_development_dependency "bundler", "~> 1.5"
  spec.add_development_dependency "rake"
  spec.add_development_dependency "rspec-rails"
  spec.add_development_dependency "activerecord-nulldb-adapter"
end
```

Use more specific dependencies than rails
user
```ruby
# coding: utf-8
lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'ar_lookups/version'

Gem::Specification.new do |spec|
  spec.name          = "ar_lookups"
  spec.version       = ArLookups::VERSION
  spec.authors       = ["Stan Bondi"]
  spec.email         = ["stan@fixate.it"]
  spec.summary       = %q{Lookup tables using activerecord and array fields}
  spec.homepage      = "https://github.com/fixate/ar_ar_lookups"
  spec.license       = "MIT"

  spec.files         = Dir['lib/**/*', '[A-Z]*'] - ['Gemfile.lock']
  spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
  spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
  spec.require_paths = ["lib"]

  spec.add_dependency 'activerecord', '~> 4.0'
  spec.add_dependency 'activesupport', '~> 4.0'

  spec.add_development_dependency "bundler", "~> 1.5"
  spec.add_development_dependency "rake"
  spec.add_development_dependency "rspec-rails"
  spec.add_development_dependency "activerecord-nulldb-adapter"
end
```
assistant