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

Gem::Specification.new do |spec|
  spec.name          = 'jrpc'
  spec.version       = JRPC::VERSION
  spec.authors       = ['Denis Talakevich']
  spec.email         = ['senid231@gmail.com']

  spec.summary       = 'JSON RPC client'
  spec.description   = 'JSON RPC client over TCP'
  spec.homepage      = 'https://github.com/senid231/jrpc'
  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_dependency 'netstring', '~> 0'
  spec.add_dependency 'oj', '~> 3.0'

  spec.add_development_dependency 'bundler', '~> 1.10'
  spec.add_development_dependency 'rake', '~> 10.0'
  spec.add_development_dependency 'rspec', '~> 3.0'
end
```

Update rake requirement from ~> 10.0 to ~> 13.0
user
```ruby
# coding: utf-8
lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'jrpc/version'

Gem::Specification.new do |spec|
  spec.name          = 'jrpc'
  spec.version       = JRPC::VERSION
  spec.authors       = ['Denis Talakevich']
  spec.email         = ['senid231@gmail.com']

  spec.summary       = 'JSON RPC client'
  spec.description   = 'JSON RPC client over TCP'
  spec.homepage      = 'https://github.com/senid231/jrpc'
  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_dependency 'netstring', '~> 0'
  spec.add_dependency 'oj', '~> 3.0'

  spec.add_development_dependency 'bundler', '~> 1.10'
  spec.add_development_dependency 'rake', '~> 13.0'
  spec.add_development_dependency 'rspec', '~> 3.0'
end
```
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