Gem

Gemfile Versioning

specifier ~>

gem 'any-gem' ~> '2.1.3'
# >= 2.1.3
# < 2.2.0

gem 'any-gem' ~> 'x.y.z'
# >= x.y.z
# < x.y+1.0

gem 'any-gem' ~> '2.2'
# >= 2.2
# < 3.0.0

gem 'any-gem' ~> 'x.y'
# >= x.y
# < x+1.0

Reference

• Gemfiles
• RubyGems version specifiers
• Semantic Versioning
• Bundler: What does :require => false in a Gemfile mean?