```ruby
# encoding: utf-8

Gem::Specification.new do |spec|
  spec.name    = "fair_dice_roll"
  spec.version = "4.0.0"

  spec.author      = "Steve Richert"
  spec.email       = "steve.richert@gmail.com"
  spec.summary     = "Guaranteed to be random."
  spec.description = "Chosen by fair dice roll. Guaranteed to be random."
  spec.homepage    = "https://github.com/laserlemon/fair_dice_roll"
  spec.license     = "MIT"

  spec.files      = `git ls-files -z`.split("\x0")
  spec.test_files = spec.files.grep(/^spec/)

  spec.add_development_dependency "bundler", "~> 1.8"
  spec.add_development_dependency "rake", "~> 10.4"
end
```

Update the bundler development gem dependency
user
```ruby
# encoding: utf-8

Gem::Specification.new do |spec|
  spec.name    = "fair_dice_roll"
  spec.version = "4.0.0"

  spec.author      = "Steve Richert"
  spec.email       = "steve.richert@gmail.com"
  spec.summary     = "Guaranteed to be random."
  spec.description = "Chosen by fair dice roll. Guaranteed to be random."
  spec.homepage    = "https://github.com/laserlemon/fair_dice_roll"
  spec.license     = "MIT"

  spec.files      = `git ls-files -z`.split("\x0")
  spec.test_files = spec.files.grep(/^spec/)

  spec.add_development_dependency "bundler", "~> 1.9"
  spec.add_development_dependency "rake", "~> 10.4"
end
```
assistant