# Dify 0.15.0 — Release & Upgrade Intelligence
- **Product:** Dify (https://dify.ai)
- **Version:** 0.15.0
- **Released:** Jan 07, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/dify/updates/0.15.0/

## Executive Summary (TL;DR)
Dify 0.15.0. Source highlight: ✨ What’s New in v0.15.0? ✨

## New Features
- Added cheaper and long context models for Qwen2.5-72B-Instruct, and a variety of speech models from siliconflow, contributed by @senseb (#12415, #12425).
- feat: mypy for all type check
- Feat/parent child retrieval
- feat(message_feedback): add content argument to feedback creation
- Feat/support parent child chunk
- Revert "Feat/parent child retrieval"

## Improvements
- We allow users to improve retrieval efficiency by child chunks independently without changing parent chunks as LLM content.
- **Multi-Version Workflows**: Manage multiple workflow versions more effectively with contributions from @warren830 (#11990).
- UI/UX adjustments for accessibility, such as replacing `div` with `button` to enhance user interaction and navigation (@TinsFox, #12046).
- Database and memory optimizations that not only improve performance but they'll likely save you headaches when loading and retrieving data (@laipz8200, #12071).
- Enhanced support for streaming modes, error feedback, and token handling to improve your coding life significantly (various contributors).
- Code refactoring to enhance readability and maintainability like using `tiktoken` for token calculations (@laipz8200, #12416).

## Bug Fixes
- Numerous typo fixes, improved error handling, and bug resolutions across the workflow, such as `tool can not run`, `HTTP method case sensitivity` by @yihong0618 (#12054, #12401), and cleaning up exceptions by @acelyc111 (#12246). Your workflow should be a lot smoother now.
- Improved error management in several components. This includes better handling of invalid URLs, file uploads, JSON parsing, and missing IDs, thanks to contributions from @laipz8200 (various PRs).
- Default value fixes to configurations like Google Storage and better formatting of URLs to keep Docker Compose happy, by @kazukitakamatsu and @cemremengu (#12188, #12072).
- Squashing bugs related to document parsing that maintained your data format integrity, addressed by @Hisir0909 (#12112).
- fix: add FileNotFoundError to ignored errors in Sentry integration
- fix: Fix session typo in workflow_trace method