diff --git a/Library/Homebrew/Gemfile.lock b/Library/Homebrew/Gemfile.lock
index a698edd1ce..182897bef6 100644
--- a/Library/Homebrew/Gemfile.lock
+++ b/Library/Homebrew/Gemfile.lock
@@ -51,7 +51,7 @@ GEM
       mini_portile2 (~> 2.4.0)
     ntlm-http (0.1.1)
     parallel (1.19.2)
-    parallel_tests (3.0.0)
+    parallel_tests (3.1.0)
       parallel
     parser (2.7.1.4)
       ast (~> 2.4.1)