```ruby
# Encoding: UTF-8
Gem::Specification.new do |s|
  s.platform          = Gem::Platform::RUBY
  s.name              = %q{refinerycms-authentication-devise}
  s.version           = %q{1.0.4}
  s.summary           = %q{Devise based authentication extension for Refinery CMS}
  s.description       = %q{A Devise authentication extension for Refinery CMS}
  s.homepage          = %q{http://refinerycms.com}
  s.authors           = ['Philip Arndt', 'Rob Yurkowski']
  s.license           = %q{MIT}
  s.require_paths     = %w(lib)

  s.files             = `git ls-files`.split("\n")
  s.test_files        = `git ls-files -- spec/*`.split("\n")

  s.add_dependency 'refinerycms-core',  ['~> 3.0', '>= 3.0.0']
  s.add_dependency 'actionmailer',      ['~> 4.2', '>= 4.2.0']
  s.add_dependency 'devise',            ['~> 3.0', '>= 3.2.4']
  s.add_dependency 'friendly_id',       '~> 5.1.0'

  s.required_ruby_version = '>= 2.0.0'
end
```

Allow refinerycms-core versions from >= 3.0.0 to < 5.0
user
```ruby
# Encoding: UTF-8
Gem::Specification.new do |s|
  s.platform          = Gem::Platform::RUBY
  s.name              = %q{refinerycms-authentication-devise}
  s.version           = %q{1.0.4}
  s.summary           = %q{Devise based authentication extension for Refinery CMS}
  s.description       = %q{A Devise authentication extension for Refinery CMS}
  s.homepage          = %q{http://refinerycms.com}
  s.authors           = ['Philip Arndt', 'Rob Yurkowski']
  s.license           = %q{MIT}
  s.require_paths     = %w(lib)

  s.files             = `git ls-files`.split("\n")
  s.test_files        = `git ls-files -- spec/*`.split("\n")

  s.add_dependency 'refinerycms-core',  ['>= 3.0.0', '< 5.0']
  s.add_dependency 'actionmailer',      ['~> 4.2', '>= 4.2.0']
  s.add_dependency 'devise',            ['~> 3.0', '>= 3.2.4']
  s.add_dependency 'friendly_id',       '~> 5.1.0'

  s.required_ruby_version = '>= 2.0.0'
end
```
assistant