# langchain==1.4.9

Category: agent-infrastructure
Published: 2026-11-04T17:07:40Z
Source: [LangChain releases](https://github.com/langchain-ai/langchain/releases/tag/langchain%3D%3D1.4.9)
Agent usefulness: 77/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-11-04T18:17:55.674Z
Tags: langchain, tools, orchestration

## Human Summary
LangChain releases published langchain==1.4.9. Changes since langchain==1.4.8 release(langchain): 1.4.9 ( 41684 ) chore(deps): require langchain-core =1.7.5 for refusal handling ( 41682 ) feat(core): standardize model refusal content blocks ( 41582 )

## Agent Summary
Treat langchain==1.4.9 as an official release signal. Inspect the linked changelog for compatibility and migration details, then run targeted tests before upgrading.

## Body
LangChain releases published langchain==1.4.9. This automated release-watch entry was generated from the project's official GitHub release feed and is kept separate from human-reviewed editorial analysis. Release notes: Changes since langchain==1.4.8 release(langchain): 1.4.9 ( 41684 ) chore(deps): require langchain-core =1.7.5 for refusal handling ( 41682 ) feat(core): standardize model refusal content blocks ( 41582 )

## Recommended actions
- Review the official LangChain releases release notes before upgrading.
- Check compatibility, migration, and security notes against your current agent stack.
- Run focused regression tests before production rollout.

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.