diff --git a/Library/Homebrew/vendor/bundle/bundler/setup.rb b/Library/Homebrew/vendor/bundle/bundler/setup.rb
index 3e03015cbd..76d0688865 100644
--- a/Library/Homebrew/vendor/bundle/bundler/setup.rb
+++ b/Library/Homebrew/vendor/bundle/bundler/setup.rb
@@ -55,7 +55,7 @@ $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/webrobots-0.1.2/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/mechanize-2.8.1/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/method_source-1.0.0/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/mustache-1.1.1/lib"
-$:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/parallel-1.20.1/lib"
+$:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/parallel-1.21.0/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/parallel_tests-3.7.1/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/parser-3.0.2.0/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/rainbow-3.0.0/lib"