diff --git a/Library/Homebrew/Gemfile.lock b/Library/Homebrew/Gemfile.lock
index 56f325e05bb4f..16dbf03050860 100644
--- a/Library/Homebrew/Gemfile.lock
+++ b/Library/Homebrew/Gemfile.lock
@@ -18,7 +18,7 @@ GEM
       tins (~> 1.6)
     diff-lcs (1.3)
     docile (1.3.2)
-    domain_name (0.5.20180417)
+    domain_name (0.5.20190701)
       unf (>= 0.0.5, < 1.0.0)
     hpricot (0.8.6)
     http-cookie (1.0.3)