Gemfile in omniauth-shopify-oauth2-2.3.1 vs Gemfile in omniauth-shopify-oauth2-2.3.2

@@ -1,11 +1,7 @@
 source "https://rubygems.org"
 
 gemspec
 
-if Gem::Version.new(RUBY_VERSION) < Gem::Version.new("2.2")
-  gem 'rack', '~> 1.6'
-end
-
 group :development, :test do
   gem 'fakeweb', git: 'https://github.com/chrisk/fakeweb.git'
 end