diff --git a/Gemfile b/Gemfile
index b2df5d3c0..4195d49c4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -49,7 +49,7 @@ gem 'social-share-button', '~> 1.1'
 gem 'sprockets', '~> 3.7.1'
 gem 'turbolinks', '~> 2.5.3'
 gem 'turnout', '~> 2.4.0'
-gem 'uglifier', '~> 3.2.0'
+gem 'uglifier', '~> 4.1.2'
 gem 'unicorn', '~> 5.4.0'
 gem 'whenever', '~> 0.10.0', require: false
 
diff --git a/Gemfile.lock b/Gemfile.lock
index f695064c4..dfd57dfff 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -462,7 +462,7 @@ GEM
       tilt (>= 1.4, < 3)
     tzinfo (1.2.4)
       thread_safe (~> 0.1)
-    uglifier (3.2.0)
+    uglifier (4.1.2)
       execjs (>= 0.3.0, < 3)
     unicode-display_width (1.3.0)
     unicorn (5.4.0)
@@ -568,7 +568,7 @@ DEPENDENCIES
   sprockets (~> 3.7.1)
   turbolinks (~> 2.5.3)
   turnout (~> 2.4.0)
-  uglifier (~> 3.2.0)
+  uglifier (~> 4.1.2)
   unicorn (~> 5.4.0)
   web-console (~> 3.3.0)
   whenever (~> 0.10.0)