source 'https://rubygems.org' group :development do gem 'rake', '~> 13.0' gem 'rake-compiler', '~> 1.0.3' gem 'rake-compiler-dock', '~> 1.0' gem 'rspec', '~> 3.0' gem 'bundler', '>= 1.16', '< 3' end group :doc do gem 'kramdown' gem 'yard', '~> 0.9' end