diff --git a/config/initializers/new_framework_defaults_7_1.rb b/config/initializers/new_framework_defaults_7_1.rb
index 9016e8014..e95cd1e7b 100644
--- a/config/initializers/new_framework_defaults_7_1.rb
+++ b/config/initializers/new_framework_defaults_7_1.rb
@@ -197,7 +197,7 @@ Rails.application.config.active_record.before_committed_on_all_records = true
 # leave this optimization off on the first deploy, then enable it on a
 # subsequent deploy.
 #++
-# Rails.application.config.active_record.marshalling_format_version = 7.1
+Rails.application.config.active_record.marshalling_format_version = 7.1
 
 ###
 # Run `after_commit` and `after_*_commit` callbacks in the order they are defined in a model.