diff --git a/test/test_helper.rb b/test/test_helper.rb
index 2965c8cda469..0300d3c540ba 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -114,6 +114,8 @@ class ActiveSupport::TestCase
   prepend TestCaseRailsLoggerExtensions
   setup :setup_dns_stubs
 
+  parallelize(workers: :number_of_processors)
+
   class << self
     alias_method :test, :it
   end