diff --git a/Library/Homebrew/test/Gemfile.lock b/Library/Homebrew/test/Gemfile.lock
index e4b652db3a..2eaa0737e0 100644
--- a/Library/Homebrew/test/Gemfile.lock
+++ b/Library/Homebrew/test/Gemfile.lock
@@ -10,7 +10,7 @@ GEM
     docile (1.3.0)
     json (2.1.0)
     parallel (1.12.1)
-    parallel_tests (2.21.2)
+    parallel_tests (2.21.3)
       parallel
     parser (2.5.0.5)
       ast (~> 2.4.0)