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

Gem::Specification.new do |spec|
  spec.name          = "active_decorator-graphql"
  spec.version       = ActiveDecorator::GraphQL::VERSION
  spec.authors       = ["Shimoyama, Hiroyasu"]
  spec.email         = ["h.shimoyama@gmail.com"]

  spec.summary       = %q{A toolkit for decorating GraphQL field objects.}
  spec.description   = %q{A toolkit for decorating GraphQL field objects using ActiveDecorator.}
  spec.homepage      = "https://github.com/hshimoyama/active_decorator-graphql"
  spec.license       = "MIT"

  spec.files = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
  spec.require_paths = ["lib"]

  spec.add_development_dependency "bundler", "~> 1.15"
  spec.add_development_dependency "pry-byebug", "~> 3.0"
  spec.add_development_dependency "rake", "~> 10.0"
  spec.add_development_dependency "rspec", "~> 3.0"

  spec.add_dependency "active_decorator"
  spec.add_dependency "graphql"
  spec.add_dependency "rails"
end
```

Update gem dependent versions in gemspec.
user
```ruby
# coding: utf-8
lib = File.expand_path("../lib", __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require "active_decorator/graphql/version"

Gem::Specification.new do |spec|
  spec.name          = "active_decorator-graphql"
  spec.version       = ActiveDecorator::GraphQL::VERSION
  spec.authors       = ["Shimoyama, Hiroyasu"]
  spec.email         = ["h.shimoyama@gmail.com"]

  spec.summary       = %q{A toolkit for decorating GraphQL field objects.}
  spec.description   = %q{A toolkit for decorating GraphQL field objects using ActiveDecorator.}
  spec.homepage      = "https://github.com/hshimoyama/active_decorator-graphql"
  spec.license       = "MIT"

  spec.files = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
  spec.require_paths = ["lib"]

  spec.add_development_dependency "bundler"
  spec.add_development_dependency "pry-byebug"
  spec.add_development_dependency "rake"
  spec.add_development_dependency "rspec"

  spec.add_runtime_dependency "active_decorator"
  spec.add_runtime_dependency "graphql"
  spec.add_runtime_dependency "rails"
end
```
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