diff --git a/Library/Homebrew/test/Gemfile.lock b/Library/Homebrew/test/Gemfile.lock
index 97b4ffc1f6..96061d8449 100644
--- a/Library/Homebrew/test/Gemfile.lock
+++ b/Library/Homebrew/test/Gemfile.lock
@@ -2,7 +2,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     metaclass (0.0.4)
-    minitest (5.5.1)
+    minitest (5.6.0)
     mocha (1.1.0)
       metaclass (~> 0.0.1)
     rake (10.4.2)