diff --git a/config/initializers/new_framework_defaults_7_1.rb b/config/initializers/new_framework_defaults_7_1.rb
index f350b00a9..eca6cac20 100644
--- a/config/initializers/new_framework_defaults_7_1.rb
+++ b/config/initializers/new_framework_defaults_7_1.rb
@@ -128,7 +128,7 @@ Rails.application.config.active_record.query_log_tags_format = :sqlcommenter
 # servers, first deploy without changing the serializer, then set the serializer
 # in a subsequent deploy.
 #++
-# Rails.application.config.active_support.message_serializer = :json_allow_marshal
+Rails.application.config.active_support.message_serializer = :json_allow_marshal
 
 ###
 # Enable a performance optimization that serializes message data and metadata