diff --git a/Gemfile.lock b/Gemfile.lock
index 02800a44b..7f18e91ba 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -324,7 +324,7 @@ GEM
     tilt (2.0.8)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    uglifier (4.1.19)
+    uglifier (4.1.20)
       execjs (>= 0.3.0, < 3)
     unf (0.1.4)
       unf_ext