diff --git a/Gemfile_rails4.lock b/Gemfile_rails4.lock
index 9364ac8f2..fa39ee6ec 100644
--- a/Gemfile_rails4.lock
+++ b/Gemfile_rails4.lock
@@ -388,7 +388,7 @@ GEM
       polyglot (>= 0.3.1)
     trollop (2.0)
     tzinfo (0.3.38)
-    uglifier (2.3.1)
+    uglifier (2.3.3)
       execjs (>= 0.3.0)
       json (>= 1.8.0)
     unf (0.1.3)
diff --git a/config/environments/production.rb.sample b/config/environments/production.rb.sample
index d486132aa..2855e6b46 100644
--- a/config/environments/production.rb.sample
+++ b/config/environments/production.rb.sample
@@ -16,6 +16,10 @@ Discourse::Application.configure do
   # Compress JavaScripts and CSS
   config.assets.compress = true
 
+  # rails 4
+  config.assets.js_compressor  = :uglifier
+  config.assets.css_compressor = :sass
+
   # stuff should be pre-compiled
   config.assets.compile = false