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

require 'prequel/version'

Gem::Specification.new do |s|
  s.name        = 'prequel'
  s.version     = Prequel::VERSION
  s.platform    = Gem::Platform::RUBY
  s.authors     = ['Nathan Sobo']
  s.email       = ['nathansobo@gmail.com']
  s.homepage    = 'http://github.com/nathansobo/prequel'
  s.summary     = 'A ground-up relational algebraic ORM.'
  s.description = "Prequel is the database library I've always wanted."

  s.add_dependency('i18n', '>= 0.5.0')
  s.add_dependency('activesupport', '>= 3.0.4')
  s.add_dependency('sequel', '>= 3.20.0')

  s.add_development_dependency 'spec', '2.5'
  s.add_development_dependency 'rr', '1.0'
  s.add_development_dependency 'pg'
  s.add_development_dependency 'differ'

  s.files        = Dir.glob('lib/**/*') + %w(LICENSE README.md)
  s.require_path = 'lib'
end
```

Fix version numbers of rspec and rr
user
```ruby
# -*- encoding: utf-8 -*-
lib = File.expand_path('../lib/', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)

require 'prequel/version'

Gem::Specification.new do |s|
  s.name        = 'prequel'
  s.version     = Prequel::VERSION
  s.platform    = Gem::Platform::RUBY
  s.authors     = ['Nathan Sobo']
  s.email       = ['nathansobo@gmail.com']
  s.homepage    = 'http://github.com/nathansobo/prequel'
  s.summary     = 'A ground-up relational algebraic ORM.'
  s.description = "Prequel is the database library I've always wanted."

  s.add_dependency('i18n', '>= 0.5.0')
  s.add_dependency('activesupport', '>= 3.0.4')
  s.add_dependency('sequel', '>= 3.20.0')

  s.add_development_dependency 'rspec', '>= 2.5'
  s.add_development_dependency 'rr', '>= 1.0'
  s.add_development_dependency 'pg'
  s.add_development_dependency 'differ'

  s.files        = Dir.glob('lib/**/*') + %w(LICENSE README.md)
  s.require_path = 'lib'
end
```
assistant