diff --git a/Gemfile b/Gemfile
index 0fb683f..2fe359e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,7 @@ group :development do
 end
 
 gem 'sass-rails', '4.0.2'
-gem 'uglifier', '2.1.1'
+gem 'uglifier', '2.7.2'
 gem 'coffee-rails', '4.0.1'
 gem 'jquery-rails', '3.0.4'
 gem 'turbolinks', '1.1.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index 2c80f70..66bc5e0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -39,7 +39,7 @@ GEM
       execjs
     coffee-script-source (1.7.0)
     erubis (2.7.0)
-    execjs (2.0.2)
+    execjs (2.8.1)
     hike (1.2.3)
     i18n (0.6.9)
     jbuilder (1.0.2)
@@ -53,7 +53,7 @@ GEM
       treetop (~> 1.4.8)
     mime-types (1.25.1)
     minitest (4.7.5)
-    multi_json (1.9.2)
+    multi_json (1.15.0)
     polyglot (0.3.4)
     rack (1.5.2)
     rack-test (0.6.2)
@@ -104,9 +104,9 @@ GEM
     turbolinks (1.1.1)
       coffee-rails
     tzinfo (0.3.39)
-    uglifier (2.1.1)
+    uglifier (2.7.2)
       execjs (>= 0.3.0)
-      multi_json (~> 1.0, >= 1.0.2)
+      json (>= 1.8.0)
 
 PLATFORMS
   ruby
@@ -123,4 +123,4 @@ DEPENDENCIES
   sdoc (= 0.3.20)
   sqlite3 (= 1.3.8)
   turbolinks (= 1.1.1)
-  uglifier (= 2.1.1)
+  uglifier (= 2.7.2)