diff --git a/Library/Homebrew/vendor/Gemfile.lock b/Library/Homebrew/vendor/Gemfile.lock
index 004c2b48ff..7dba7589fb 100644
--- a/Library/Homebrew/vendor/Gemfile.lock
+++ b/Library/Homebrew/vendor/Gemfile.lock
@@ -13,7 +13,7 @@ GEM
       concurrent-ruby (~> 1.0)
     jaro_winkler (1.5.2)
     minitest (5.11.3)
-    parallel (1.12.1)
+    parallel (1.13.0)
     parser (2.6.0.0)
       ast (~> 2.4.0)
     plist (3.5.0)