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

Gem::Specification.new do |gem|
  gem.authors       = ["benoist"]
  gem.email         = ["benoist.claassen@gmail.com"]
  gem.description   = %q{This gem is a (partial) implementation of the XMLDsig specification}
  gem.summary       = %q{This gem is a (partial) implementation of the XMLDsig specification (http://www.w3.org/TR/xmldsig-core)}
  gem.homepage      = "https://github.com/benoist/xmldsig"

  gem.files         = `git ls-files`.split($\)
  gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
  gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
  gem.name          = "xmldsig"
  gem.license       = 'MIT'
  gem.require_paths = ["lib"]
  gem.version       = Xmldsig::VERSION

  gem.add_dependency("nokogiri", '~> 1.6.8')
end
```

Allow all 1.x.y versions of Nokogiri
user
```ruby
# -*- encoding: utf-8 -*-
require File.expand_path('../lib/xmldsig/version', __FILE__)

Gem::Specification.new do |gem|
  gem.authors       = ["benoist"]
  gem.email         = ["benoist.claassen@gmail.com"]
  gem.description   = %q{This gem is a (partial) implementation of the XMLDsig specification}
  gem.summary       = %q{This gem is a (partial) implementation of the XMLDsig specification (http://www.w3.org/TR/xmldsig-core)}
  gem.homepage      = "https://github.com/benoist/xmldsig"

  gem.files         = `git ls-files`.split($\)
  gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
  gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
  gem.name          = "xmldsig"
  gem.license       = 'MIT'
  gem.require_paths = ["lib"]
  gem.version       = Xmldsig::VERSION

  gem.add_dependency("nokogiri", '>= 1.6.8', '< 2.0.0')
end
```
assistant