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

Gem::Specification.new do |spec|
  spec.name          = "tty-file"
  spec.version       = TTY::File::VERSION
  spec.authors       = ["Piotr Murach"]
  spec.email         = [""]

  spec.summary       = %q{File manipulation utility methods}
  spec.description   = %q{File manipulation utility methods}
  spec.homepage      = "https://piotrmurach.github.io/tty"
  spec.license       = "MIT"

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

  spec.add_dependency 'pastel',     '~> 0.7.1'
  spec.add_dependency 'tty-prompt', '~> 0.13.2'
  spec.add_dependency 'diff-lcs',   '~> 1.3.0'

  spec.add_development_dependency 'bundler', '~> 1.5'
  spec.add_development_dependency 'rake', '~> 10.0'
  spec.add_development_dependency 'rspec', '~> 3.0'
end
```

Change to update dependencies and lock ruby version
user
```ruby
# coding: utf-8
lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'tty/file/version'

Gem::Specification.new do |spec|
  spec.name          = "tty-file"
  spec.version       = TTY::File::VERSION
  spec.authors       = ["Piotr Murach"]
  spec.email         = [""]

  spec.summary       = %q{File manipulation utility methods.}
  spec.description   = %q{File manipulation utility methods.}
  spec.homepage      = "https://piotrmurach.github.io/tty"
  spec.license       = "MIT"

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

  spec.required_ruby_version = '>= 2.0.0'

  spec.add_dependency 'pastel',     '~> 0.7.2'
  spec.add_dependency 'tty-prompt', '~> 0.14.0'
  spec.add_dependency 'diff-lcs',   '~> 1.3.0'

  spec.add_development_dependency 'bundler', '~> 1.5'
  spec.add_development_dependency 'rake', '~> 10.0'
  spec.add_development_dependency 'rspec', '~> 3.0'
end
```
assistant