diff --git a/Library/Homebrew/Gemfile.lock b/Library/Homebrew/Gemfile.lock
index f738e7712f..52b3864b5c 100644
--- a/Library/Homebrew/Gemfile.lock
+++ b/Library/Homebrew/Gemfile.lock
@@ -178,7 +178,7 @@ GEM
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.8)
-    unicode-display_width (2.0.0)
+    unicode-display_width (2.1.0)
     uri_template (0.7.0)
     warning (1.2.0)
     webrick (1.7.0)