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

Gem::Specification.new do |spec|
  spec.name          = 'vagrant-omnibus'
  spec.version       = VagrantPlugins::Omnibus::VERSION
  spec.authors       = ['Seth Chisamore']
  spec.email         = ['schisamo@opscode.com']
  spec.description   = 'A Vagrant plugin that ensures the desired version of' \
                       ' Chef is installed via the platform-specific Omnibus' \
                       ' packages.'
  spec.summary       = spec.description
  spec.homepage      = 'https://github.com/opscode/vagrant-omnibus'
  spec.license       = 'Apache 2.0'

  spec.files         = `git ls-files`.split($INPUT_RECORD_SEPARATOR)
  spec.executables   = spec.files.grep(/^bin\//) { |f| File.basename(f) }
  spec.test_files    = spec.files.grep(/^(test|spec|features)\//)
  spec.require_paths = ['lib']

  spec.add_development_dependency 'bundler', '~> 1.3'
  spec.add_development_dependency 'rake', '~> 10.3.2'
  spec.add_development_dependency 'rspec', '~> 2.99.0'
  spec.add_development_dependency 'rubocop', '~> 0.18.1'
end
```

Use Rake 11.X not 10.X
user
```ruby
# coding: utf-8
lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'vagrant-omnibus/version'

Gem::Specification.new do |spec|
  spec.name          = 'vagrant-omnibus'
  spec.version       = VagrantPlugins::Omnibus::VERSION
  spec.authors       = ['Seth Chisamore']
  spec.email         = ['schisamo@opscode.com']
  spec.description   = 'A Vagrant plugin that ensures the desired version of' \
                       ' Chef is installed via the platform-specific Omnibus' \
                       ' packages.'
  spec.summary       = spec.description
  spec.homepage      = 'https://github.com/opscode/vagrant-omnibus'
  spec.license       = 'Apache 2.0'

  spec.files         = `git ls-files`.split($INPUT_RECORD_SEPARATOR)
  spec.executables   = spec.files.grep(/^bin\//) { |f| File.basename(f) }
  spec.test_files    = spec.files.grep(/^(test|spec|features)\//)
  spec.require_paths = ['lib']

  spec.add_development_dependency 'bundler', '~> 1.3'
  spec.add_development_dependency 'rake', '~> 11.0'
  spec.add_development_dependency 'rspec', '~> 2.99.0'
  spec.add_development_dependency 'rubocop', '~> 0.18.1'
end
```
assistant