Gemfile in message_bus-2.1.5 vs Gemfile in message_bus-2.1.6

@@ -3,14 +3,16 @@
 # Specify your gem's dependencies in message_bus.gemspec
 gemspec
 
 group :test do
   gem 'minitest'
+  gem 'minitest-hooks'
   gem 'rake'
   gem 'http_parser.rb'
   gem 'thin'
   gem 'rack-test', require: 'rack/test'
   gem 'jasmine'
 end
 
 gem 'redis'
 gem 'rack'
+gem 'concurrent-ruby' # for distributed-cache