source 'https://rubygems.org' group :development, :test do gem 'jekyll', '~> 4.2.0' gem 'jekyll-seo-tag', '~> 2.7.1' gem 'jekyll-sitemap', '~> 1.4.0' gem 'wdm', '~> 0.1.1', :install_if => Gem.win_platform? end