diff --git a/Gemfile.lock b/Gemfile.lock
index 0797bee..bebc601 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -310,7 +310,7 @@ GEM
     turbolinks-source (5.0.3)
     tzinfo (1.2.4)
       thread_safe (~> 0.1)
-    uglifier (3.2.0)
+    uglifier (4.0.1)
       execjs (>= 0.3.0, < 3)
     unicode-display_width (1.3.0)
     unicorn (5.3.1)