diff --git a/Gemfile.lock b/Gemfile.lock
index 8fc0de8..826c08f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -249,7 +249,7 @@ GEM
       thread_safe (~> 0.1)
     tzinfo-data (1.2017.3)
       tzinfo (>= 1.0.0)
-    uglifier (4.1.4)
+    uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
     warden (1.2.7)
       rack (>= 1.0)