diff --git a/Library/Homebrew/Gemfile.lock b/Library/Homebrew/Gemfile.lock
index b9c1317cbf..c1683c68ad 100644
--- a/Library/Homebrew/Gemfile.lock
+++ b/Library/Homebrew/Gemfile.lock
@@ -49,7 +49,7 @@ GEM
       mini_portile2 (~> 2.4.0)
     ntlm-http (0.1.1)
     parallel (1.17.0)
-    parallel_tests (2.28.0)
+    parallel_tests (2.29.0)
       parallel
     parser (2.6.3.0)
       ast (~> 2.4.0)