```ruby
# -*- encoding: utf-8 -*-
require File.expand_path('../lib/omniauth-cabify/version', __FILE__)

Gem::Specification.new do |gem|
  gem.authors       = ["Michael Koper"]
  gem.email         = ["michaelkoper@gmail.com"]
  gem.description   = %q{Official OmniAuth strategy for Cabify.}
  gem.summary       = %q{Official OmniAuth strategy for Cabify.}
  gem.homepage      = "https://github.com/michaelkoper/omniauth-cabify"
  gem.license       = "MIT"

  gem.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
  gem.files         = `git ls-files`.split("\n")
  gem.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
  gem.name          = "omniauth-cabify"
  gem.require_paths = ["lib"]
  gem.version       = OmniAuth::Cabify::VERSION

  gem.add_dependency 'omniauth', '~> 1.0'
  gem.add_dependency 'omniauth-oauth2', '~> 1.1'
  gem.add_development_dependency 'rspec', '~> 2.7'
  gem.add_development_dependency 'rack-test'
  gem.add_development_dependency 'webmock'
end
```

Update gemspec for Bundler gem style
user
```ruby
# -*- encoding: utf-8 -*-

lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'omniauth-cabify/version'

Gem::Specification.new do |gem|
  gem.name          = 'omniauth-cabify'
  gem.version       = OmniAuth::Cabify::VERSION
  gem.authors       = ['Michael Koper']
  gem.email         = ['michaelkoper@gmail.com']

  gem.description   = 'Official OmniAuth strategy for Cabify.'
  gem.summary       = 'Official OmniAuth strategy for Cabify.'
  gem.homepage      = 'https://github.com/michaelkoper/omniauth-cabify'
  gem.license       = 'MIT'

  gem.files         = `git ls-files -z`.split("\x0").reject do |f|
    f.match(%r{^(test|spec|features)/})
  end
  gem.executables   = gem.files.grep(%r{^bin/}) { |f| File.basename(f) }
  gem.require_paths = ['lib']

  gem.add_dependency 'omniauth', '~> 1'
  gem.add_dependency 'omniauth-oauth2', '~> 1'

  gem.add_development_dependency 'bundler', '~> 1.15'
  gem.add_development_dependency 'rack-test'
  gem.add_development_dependency 'rake', '~> 10.0'
  gem.add_development_dependency 'rspec', '~> 3.0'
  gem.add_development_dependency 'webmock'
end
```
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