diff --git a/Library/Homebrew/test/Gemfile.lock b/Library/Homebrew/test/Gemfile.lock
index 4e622c0df4..489e6417da 100644
--- a/Library/Homebrew/test/Gemfile.lock
+++ b/Library/Homebrew/test/Gemfile.lock
@@ -14,7 +14,7 @@ GEM
     jaro_winkler (1.5.2)
     json (2.1.0)
     mustache (1.1.0)
-    parallel (1.12.1)
+    parallel (1.13.0)
     parallel_tests (2.27.1)
       parallel
     parser (2.6.0.0)