diff --git a/db/migrate/202410926031029_add_user_info_to_user_actions.rb b/db/migrate/202410926031029_add_user_info_to_user_actions.rb
index 967e8a68d..608046339 100644
--- a/db/migrate/202410926031029_add_user_info_to_user_actions.rb
+++ b/db/migrate/202410926031029_add_user_info_to_user_actions.rb
@@ -6,7 +6,7 @@ class AddUserInfoToUserActions < ActiveRecord::Migration[5.2]
     add_column :user_actions, :memo, :text
 
     UserAction.find_in_batches(batch_size: 1000) do |sw|
-      Parallel.each(sw, in_threads: 5) do |user_action|
+      Parallel.each(sw, in_threads: 1) do |user_action|
         if user_action.user.present?
           user_action.login = user_action.user&.login
           user_action.email = user_action.user&.mail