diff --git a/Gemfile.lock b/Gemfile.lock
index c6711a5..7654188 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -313,7 +313,7 @@ GEM
       thread_safe (~> 0.1)
     uglifier (4.1.11)
       execjs (>= 0.3.0, < 3)
-    unicode-display_width (1.3.3)
+    unicode-display_width (1.4.0)
     unicorn (5.4.0)
       kgio (~> 2.6)
       raindrops (~> 0.7)