diff --git a/config/initializers/new_framework_defaults_7_1.rb b/config/initializers/new_framework_defaults_7_1.rb
index eca6cac20..7ac88e74f 100644
--- a/config/initializers/new_framework_defaults_7_1.rb
+++ b/config/initializers/new_framework_defaults_7_1.rb
@@ -141,7 +141,7 @@ Rails.application.config.active_support.message_serializer = :json_allow_marshal
 # leave this optimization off on the first deploy, then enable it on a
 # subsequent deploy.
 #++
-# Rails.application.config.active_support.use_message_serializer_for_metadata = true
+Rails.application.config.active_support.use_message_serializer_for_metadata = true
 
 ###
 # Set the maximum size for Rails log files.