```ruby
version = File.read(File.expand_path("../../RAILS_VERSION", __FILE__)).strip

Gem::Specification.new do |s|
  s.platform    = Gem::Platform::RUBY
  s.name        = 'activesupport'
  s.version     = version
  s.summary     = 'A toolkit of support libraries and Ruby core extensions extracted from the Rails framework.'
  s.description = 'A toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Rich support for multibyte strings, internationalization, time zones, and testing.'

  s.required_ruby_version = '>= 1.9.3'
  s.license     = 'MIT'

  s.author       = 'David Heinemeier Hansson'
  s.email        = 'david@loudthinking.com'
  s.homepage     = 'http://www.rubyonrails.org'

  s.files        = Dir['CHANGELOG.md', 'MIT-LICENSE', 'README.rdoc', 'lib/**/*']
  s.require_path = 'lib'

  s.rdoc_options.concat ['--encoding',  'UTF-8']

  s.add_dependency('i18n',       '~> 0.6')
  s.add_dependency('multi_json', '~> 1.3')
  s.add_dependency('tzinfo',     '~> 0.3.33')
  s.add_dependency('minitest',   '~> 3.2')
end
```

Update minitest dependency to ~> 4.0
user
```ruby
version = File.read(File.expand_path("../../RAILS_VERSION", __FILE__)).strip

Gem::Specification.new do |s|
  s.platform    = Gem::Platform::RUBY
  s.name        = 'activesupport'
  s.version     = version
  s.summary     = 'A toolkit of support libraries and Ruby core extensions extracted from the Rails framework.'
  s.description = 'A toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Rich support for multibyte strings, internationalization, time zones, and testing.'

  s.required_ruby_version = '>= 1.9.3'
  s.license     = 'MIT'

  s.author       = 'David Heinemeier Hansson'
  s.email        = 'david@loudthinking.com'
  s.homepage     = 'http://www.rubyonrails.org'

  s.files        = Dir['CHANGELOG.md', 'MIT-LICENSE', 'README.rdoc', 'lib/**/*']
  s.require_path = 'lib'

  s.rdoc_options.concat ['--encoding',  'UTF-8']

  s.add_dependency('i18n',       '~> 0.6')
  s.add_dependency('multi_json', '~> 1.3')
  s.add_dependency('tzinfo',     '~> 0.3.33')
  s.add_dependency('minitest',   '~> 4.0')
end
```
assistant