diff --git a/Library/Homebrew/Gemfile.lock b/Library/Homebrew/Gemfile.lock
index aa03abcb2d..656ab2f2ca 100644
--- a/Library/Homebrew/Gemfile.lock
+++ b/Library/Homebrew/Gemfile.lock
@@ -129,7 +129,7 @@ GEM
       rubocop
     ruby-macho (2.5.0)
     ruby-progressbar (1.11.0)
-    simplecov (0.20.0)
+    simplecov (0.21.2)
       docile (~> 1.1)
       simplecov-html (~> 0.11)
       simplecov_json_formatter (~> 0.1)