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

Gem::Specification.new do |spec|
  spec.name          = "govuk-client-url_arbiter"
  spec.version       = Govuk::Client::UrlArbiter::VERSION
  spec.authors       = ["Alex Tomlins"]
  spec.email         = ["alex.tomlins@digital.cabinet-office.gov.uk"]
  spec.summary       = %q{TODO: Write a short summary. Required.}
  spec.description   = %q{TODO: Write a longer description. Optional.}
  spec.homepage      = ""
  spec.license       = "MIT"

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

  spec.add_development_dependency "rake"
  spec.add_development_dependency "gem_publisher", "~> 1.4"
end
```

Update summary and homepage in gemspec
user
```ruby
# coding: utf-8
lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'govuk/client/url_arbiter/version'

Gem::Specification.new do |spec|
  spec.name          = "govuk-client-url_arbiter"
  spec.version       = Govuk::Client::UrlArbiter::VERSION
  spec.authors       = ["Alex Tomlins"]
  spec.email         = ["alex.tomlins@digital.cabinet-office.gov.uk"]
  spec.summary       = %q{API client for the url-arbiter}
  spec.homepage      = "https://github.com/alphagov/govuk-client-url_arbiter"
  spec.license       = "MIT"

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

  spec.add_development_dependency "rake"
  spec.add_development_dependency "gem_publisher", "~> 1.4"
end
```
assistant