# Dify 1.9.1 — Release & Upgrade Intelligence
- **Product:** Dify (https://dify.ai)
- **Version:** 1.9.1
- **Released:** Sep 29, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/dify/updates/1.9.1/

## Executive Summary (TL;DR)
Dify 1.9.1. Source highlight: Congratulations on having our 1000th contributor!

## New Features
- **Infrastructure & DevOps**:
- Next.js upgraded to 15.5, now leveraging Turbopack in development for a faster, more modern build pipeline by @17hz in #24346.
- Provided `X-Dify-Version` headers in marketplace API access for better traceability by @RockChinQ in #26210.
- Security reporting improvements, with new sec report workflow added by @crazywoola in #26313.
- **Pipelines & Engines**:
- Built-in pipeline templates now support language configuration, unlocking multilingual deployments by @WTW0313 in #26124.

## Improvements
- improve: pooling httpx clients for requests to code sandbox and ssrf
- perf: provide X-Dify-Version for marketplace api access
- perf: distribute concurrent plugin auto upgrade tasks

## Bug Fixes
- **Debugging & Logging**:
- Fixed NodeRunRetryEvent debug logging not working properly in Graph Engine by @quicksandznzn in #26085.
- Fixed LLM node losing Flask context during parallel iterations, ensuring stable concurrent runs by @quicksandznzn in #26098.
- Fixed agent-strategy prompt generator error by @quicksandznzn in #26278.
- **Search & Parsing**:
- Fixed `full_text_search` name reliability by @JohnJyong in #26104.