diff --git a/Library/Homebrew/Gemfile.lock b/Library/Homebrew/Gemfile.lock
index f303343f8fb2a..d5668d6985c1f 100644
--- a/Library/Homebrew/Gemfile.lock
+++ b/Library/Homebrew/Gemfile.lock
@@ -202,7 +202,7 @@ GEM
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.8.2)
-    unicode-display_width (2.3.0)
+    unicode-display_width (2.4.2)
     unparser (0.6.4)
       diff-lcs (~> 1.3)
       parser (>= 3.1.0)