diff --git a/Gemfile.lock b/Gemfile.lock
index 3c0c496..93503dc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -238,7 +238,7 @@ 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