diff --git a/spec/dummy/config/initializers/new_framework_defaults.rb b/spec/dummy/config/initializers/new_framework_defaults.rb
index <HASH>..<HASH> 100644
--- a/spec/dummy/config/initializers/new_framework_defaults.rb
+++ b/spec/dummy/config/initializers/new_framework_defaults.rb
@@ -15,7 +15,7 @@ Rails.application.config.action_controller.forgery_protection_origin_check = tru
 ActiveSupport.to_time_preserves_timezone = true
 
 # Require `belongs_to` associations by default. Previous versions had false.
-Rails.application.config.active_record.belongs_to_required_by_default = false
+Rails.application.config.active_record.belongs_to_required_by_default = true
 
 # Do not halt callback chains when a callback returns false. Previous versions had true.
 ActiveSupport.halt_callback_chains_on_return_false = false
re-enable belongs_to_required_by_default