diff --git a/test/test_helper.rb b/test/test_helper.rb
index 24840d560..3ab1e721d 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -43,7 +43,7 @@ EInvoice.provider = EInvoice::Providers::TestProvider.new
 
 class ActiveSupport::TestCase
   # Run tests in parallel with specified workers
-  # parallelize(workers: :number_of_processors)
+  parallelize(workers: :number_of_processors)
 
   ActiveRecord::Migration.check_pending!
   fixtures :all