Gemfile in resque-scheduler-4.6.0 vs Gemfile in resque-scheduler-4.7.0

@@ -13,6 +13,15 @@
   gem 'rufus-scheduler', git: 'https://github.com/jmettraux/rufus-scheduler'
 else
   gem 'rufus-scheduler', rufus_scheduler_version
 end
 
+case redis_version = ENV.fetch('REDIS_VERSION', 'latest')
+when 'master'
+  gem 'redis', git: 'https://github.com/redis/redis-rb'
+when 'latest'
+  gem 'redis'
+else
+  gem 'redis', redis_version
+end
+
 gemspec