diff --git a/Gemfile b/Gemfile
index 854ad9e..cd11100 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,7 +12,7 @@ gem 'sqlite3', '~> 1.3.7', group: [:development, :test]
 gem 'sass-rails', '~> 4.0.0'
 
 # Use Uglifier as compressor for JavaScript assets
-gem 'uglifier', '~> 1.3.0'
+gem 'uglifier', '~> 2.7.2'
 
 # Use CoffeeScript for .js.coffee assets and views
 gem 'coffee-rails', '~> 4.0.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 791aee3..c0642e7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -45,7 +45,7 @@ GEM
     domain_name (0.5.21)
       unf (>= 0.0.5, < 1.0.0)
     erubis (2.7.0)
-    execjs (2.2.1)
+    execjs (2.8.1)
     hike (1.2.3)
     http-cookie (1.0.2)
       domain_name (~> 0.5)
@@ -69,7 +69,7 @@ GEM
     mime-types (1.25.1)
     mini_portile (0.6.0)
     minitest (4.7.5)
-    multi_json (1.10.1)
+    multi_json (1.15.0)
     net-http-digest_auth (1.4)
     net-http-persistent (2.9.4)
     newrelic_rpm (3.9.4.245)
@@ -130,9 +130,9 @@ GEM
     turbolinks (1.3.1)
       coffee-rails
     tzinfo (0.3.41)
-    uglifier (1.3.0)
+    uglifier (2.7.2)
       execjs (>= 0.3.0)
-      multi_json (~> 1.0, >= 1.0.2)
+      json (>= 1.8.0)
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.6)
@@ -161,5 +161,5 @@ DEPENDENCIES
   sdoc (~> 0.3.0)
   sqlite3 (~> 1.3.7)
   turbolinks (~> 1.3.0)
-  uglifier (~> 1.3.0)
+  uglifier (~> 2.7.2)
   unicorn (~> 4.6.0)