diff --git a/Library/Homebrew/Gemfile.lock b/Library/Homebrew/Gemfile.lock
index 308d44ddfe..77fde37e22 100644
--- a/Library/Homebrew/Gemfile.lock
+++ b/Library/Homebrew/Gemfile.lock
@@ -102,13 +102,13 @@ GEM
     rspec-support (3.10.0)
     rspec-wait (0.0.9)
       rspec (>= 3, < 4)
-    rubocop (1.3.1)
+    rubocop (1.5.1)
       parallel (~> 1.10)
       parser (>= 2.7.1.5)
       rainbow (>= 2.2.2, < 4.0)
-      regexp_parser (>= 1.8)
+      regexp_parser (>= 2.0)
       rexml
-      rubocop-ast (>= 1.1.1)
+      rubocop-ast (>= 1.2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 2.0)
     rubocop-ast (1.3.0)