Fix old reference to ActionController::Failsafe

railties/lib/initializer.rb

@@ -462,7 +462,7 @@ def initialize_cache
 
         if RAILS_CACHE.respond_to?(:middleware)
           # Insert middleware to setup and teardown local cache for each request
-          configuration.middleware.insert_after(:"ActionController::Failsafe", RAILS_CACHE.middleware)
+          configuration.middleware.insert_after(:"ActionDispatch::Failsafe", RAILS_CACHE.middleware)
         end
       end
     end