# Saleor 3.15.18 — Release & Upgrade Intelligence
- **Product:** Saleor (https://saleor.io)
- **Version:** 3.15.18
- **Released:** Dec 06, 2023
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/saleor/updates/3.15.18/

## Executive Summary (TL;DR)
Saleor 3.15.18. Source highlight: Fix attributes save performance (#14939) (d1f6d9d2b8)

## New Features
- Add an upper index on user email  (#14923) (5344264f39)
- Add missing lock to avoid deadlocks between checkout process and payment plugins (#14889) (04de6ca7c2)

## Bug Fixes
- Fix attributes save performance (#14939) (d1f6d9d2b8)