diff --git a/app/controllers/main_controller.rb b/app/controllers/main_controller.rb
--- a/app/controllers/main_controller.rb
+++ b/app/controllers/main_controller.rb
@@ -1,19 +1,19 @@
 class MainController < ApplicationController
 
-  before_filter :authenticate, :except => [:index, :login]
-  before_filter :check_viewability, :except => [:index, :login]
+  before_action :authenticate, :except => [:index, :login]
+  before_action :check_viewability, :except => [:index, :login]
 
-  append_before_filter :confirm_and_update_start_time, 
+  append_before_action :confirm_and_update_start_time, 
                        :except => [:index, 
                                    :login, 
                                    :confirm_contest_start]
 
   # to prevent log in box to be shown when user logged out of the
   # system only in some tab
-  prepend_before_filter :reject_announcement_refresh_when_logged_out, 
+  prepend_before_action :reject_announcement_refresh_when_logged_out, 
                         :only => [:announcements]
 
-  before_filter :authenticate_by_ip_address, :only => [:list]
+  before_action :authenticate_by_ip_address, :only => [:list]
 
   # COMMENTED OUT: filter in each action instead
   # before_filter :verify_time_limit, :only => [:submit]