Gemfile in ransack-1.8.10 vs Gemfile in ransack-2.0.0

@@ -20,11 +20,11 @@
     gem 'activesupport'
     gem 'activemodel'
     gem 'activerecord', require: false
     gem 'actionpack'
   end
-  if rails == 'v5.2.0'
+  if rails >= 'v5.2.0'
     gem 'mysql2', '~> 0.4.4'
   end
 else
   git 'git://github.com/rails/rails.git', :branch => rails do
     gem 'activesupport'
@@ -36,17 +36,9 @@
     gem 'mysql2', '< 0.3'
   end
   if rails == '5-2-stable'
     gem 'mysql2', '~> 0.4.4'
   end
-end
-
-if ENV['DB'] =~ /mongoid4/
-  gem 'mongoid', '~> 4.0.0', require: false
-end
-
-if ENV['DB'] =~ /mongoid5/
-  gem 'mongoid', '~> 5.0.0', require: false
 end
 
 group :test do
   # TestUnit was removed from Ruby 2.2 but still needed for testing Rails 3.x.
   gem 'test-unit', '~> 3.0' if RUBY_VERSION >= '2.2'