diff --git a/Gemfile b/Gemfile
index 5bb897089..a5266c1ae 100644
--- a/Gemfile
+++ b/Gemfile
@@ -58,7 +58,7 @@ gem "sprockets", "~> 3.7.2"
 gem "translator-text", "~> 0.1.0"
 gem "turbolinks", "~> 5.2.1"
 gem "turnout", "~> 2.5.0"
-gem "uglifier", "~> 4.1.2"
+gem "uglifier", "~> 4.2.0"
 gem "whenever", "~> 1.0.0", require: false
 gem "wicked_pdf", "~> 2.1.0"
 gem "wkhtmltopdf-binary", "~> 0.12.4"
diff --git a/Gemfile.lock b/Gemfile.lock
index fce4660e1..be8ab32a4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -593,7 +593,7 @@ GEM
       tilt (>= 1.4, < 3)
     tzinfo (1.2.7)
       thread_safe (~> 0.1)
-    uglifier (4.1.19)
+    uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
     unicode-display_width (1.7.0)
     uniform_notifier (1.13.0)
@@ -718,7 +718,7 @@ DEPENDENCIES
   translator-text (~> 0.1.0)
   turbolinks (~> 5.2.1)
   turnout (~> 2.5.0)
-  uglifier (~> 4.1.2)
+  uglifier (~> 4.2.0)
   web-console (~> 3.7.0)
   webdrivers (~> 4.3.0)
   whenever (~> 1.0.0)