diff --git a/Gemfile.lock b/Gemfile.lock
index 0de867c8..a09c6865 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -288,7 +288,7 @@ GEM
     tilt (2.0.8)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    uglifier (4.1.18)
+    uglifier (4.1.20)
       execjs (>= 0.3.0, < 3)
     unicode_utils (1.4.0)
     warden (1.2.7)