# LangChain langchain==1.4.9 — Release & Upgrade Intelligence
- **Product:** LangChain (https://langchain.com)
- **Version:** langchain==1.4.9
- **Released:** Nov 04, 2026
- **Impact Score:** 4/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/langchain/updates/langchain-1.4.9/

## Executive Summary (TL;DR)
LangChain 1.4.9 updates the langchain-core dependency to version 1.7.5 or higher to support standardized model refusal content blocks. This release introduces a standardized way to handle model refusals across different providers.

## New Features
- Standardized model refusal content blocks

## Improvements
- Updated langchain-core dependency to >=1.7.5 for refusal handling support