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

Gem::Specification.new do |gem|
  gem.name          = "csscss"
  gem.version       = Csscss::VERSION
  gem.authors       = ["Zach Moazeni"]
  gem.email         = ["zach.moazeni@gmail.com"]
  gem.summary       = %q{A CSS redundancy analyzer that analyzes redundancy.}
  gem.description   = %q{csscss will parse any CSS files you give it and let you know which rulesets have duplicated declarations.}
  gem.homepage      = "http://zmoazeni.github.com/csscss/"

  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.require_paths = ["lib"]

  gem.add_dependency "parslet", "~> 1.5"
  gem.add_dependency "colorize"
end
```

Add a required version of ruby to the gemspec.
user
```ruby
# -*- encoding: utf-8 -*-
lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'csscss/version'

Gem::Specification.new do |gem|
  gem.name          = "csscss"
  gem.version       = Csscss::VERSION
  gem.authors       = ["Zach Moazeni"]
  gem.email         = ["zach.moazeni@gmail.com"]
  gem.summary       = %q{A CSS redundancy analyzer that analyzes redundancy.}
  gem.description   = %q{csscss will parse any CSS files you give it and let you know which rulesets have duplicated declarations.}
  gem.homepage      = "http://zmoazeni.github.com/csscss/"

  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.require_paths = ["lib"]

  gem.required_ruby_version = ">= 1.9.2"

  gem.add_dependency "parslet", "~> 1.5"
  gem.add_dependency "colorize"
end
```
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