diff --git a/Library/Homebrew/Gemfile.lock b/Library/Homebrew/Gemfile.lock
index 356a55309be20..750442f454471 100644
--- a/Library/Homebrew/Gemfile.lock
+++ b/Library/Homebrew/Gemfile.lock
@@ -48,7 +48,7 @@ GEM
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
     ntlm-http (0.1.1)
-    parallel (1.17.0)
+    parallel (1.18.0)
     parallel_tests (2.29.2)
       parallel
     parser (2.6.5.0)