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

Gem::Specification.new do |spec|
  spec.name          = 'transproc'
  spec.version       = Transproc::VERSION.dup
  spec.authors       = ['Piotr Solnica']
  spec.email         = ['piotr.solnica@gmail.com']
  spec.summary       = 'Transform Ruby objects in functional style'
  spec.description   = spec.summary
  spec.homepage      = 'http://solnic.github.io/transproc/'
  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.required_ruby_version = '>= 2.2.0'

  spec.add_development_dependency 'bundler', '~> 1.7'
  spec.add_development_dependency 'rake', '~> 10.0'
  spec.add_development_dependency 'rspec', '~> 3.3'
end
```

Set minimal ruby version to 2.3
user
```ruby
lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'transproc/version'

Gem::Specification.new do |spec|
  spec.name          = 'transproc'
  spec.version       = Transproc::VERSION.dup
  spec.authors       = ['Piotr Solnica']
  spec.email         = ['piotr.solnica@gmail.com']
  spec.summary       = 'Transform Ruby objects in functional style'
  spec.description   = spec.summary
  spec.homepage      = 'http://solnic.github.io/transproc/'
  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.required_ruby_version = '>= 2.3.0'

  spec.add_development_dependency 'bundler', '~> 1.7'
  spec.add_development_dependency 'rake', '~> 10.0'
  spec.add_development_dependency 'rspec', '~> 3.3'
end
```
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