# Dify 0.5.5 — Release & Upgrade Intelligence
- **Product:** Dify (https://dify.ai)
- **Version:** 0.5.5
- **Released:** Feb 13, 2024
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/dify/updates/0.5.5/

## Executive Summary (TL;DR)
Dify 0.5.5. Source highlight: Adding SMTP method for sending emails. Thanks @jonahcui!

## New Features
- feat: add support for smtp when send email
- pref: optimize add hit count query performance when dataset hit

## Bug Fixes
- fix: api based extension modal title
- fix: typo in package path of core.splitter
- fix: studio/api doc
- fix: chat agent mode content copy
- fix: possible unsent function call in the last chunk of streaming response in OpenAI provider
- fix: List not found in account service