diff --git a/test/test_helper.rb b/test/test_helper.rb
index 0363bc37aca9..a9ffa63fa299 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -94,6 +94,8 @@ class ActiveSupport::TestCase
   prepend TestCaseRailsLoggerExtensions
   setup :setup_dns_stubs
 
+  parallelize(workers: :number_of_processors)
+
   class << self
     alias_method :test, :it
   end