diff --git a/Gemfile.lock b/Gemfile.lock
index 0f7f2c5..fe8e06f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -316,7 +316,7 @@ GEM
     tilt (2.0.8)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    uglifier (3.2.0)
+    uglifier (4.1.6)
       execjs (>= 0.3.0, < 3)
     unf (0.1.4)
       unf_ext