diff --git a/Library/Homebrew/test/Gemfile.lock b/Library/Homebrew/test/Gemfile.lock
index 79b210d897..9e85fb2cfd 100644
--- a/Library/Homebrew/test/Gemfile.lock
+++ b/Library/Homebrew/test/Gemfile.lock
@@ -20,6 +20,7 @@ GEM
     parser (2.6.0.0)
       ast (~> 2.4.0)
     powerpack (0.1.2)
+    psych (3.1.0)
     rainbow (3.0.0)
     rdiscount (2.2.0.1)
     ronn (0.7.3)
@@ -46,11 +47,12 @@ GEM
     rspec-support (3.8.0)
     rspec-wait (0.0.9)
       rspec (>= 3, < 4)
-    rubocop (0.64.0)
+    rubocop (0.65.0)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
       parser (>= 2.5, != 2.5.1.1)
       powerpack (~> 0.1)
+      psych (>= 3.1.0)
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.4.0)