langchain

vlangchain==1.3.0 scope: langchain Feature

This release adds 1 notable feature for engineering teams evaluating rollout.

Published 22d AI Agents & Assistants

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✓ No known CVEs patched in this version

Topics

agents ai ai-agents anthropic chatgpt deepagents

+11 more

enterprise gemini generative-ai langchain langgraph llm multiagent openai pydantic python typescript

ReleasePort's take

Light signal

editorial:auto 13d

LangChain 1.3.0 adds version="v3" support for stream_events and astream_events, enabling newer agent workflows.

Why it matters: Test the new v3 endpoint in development before deploying to production; no immediate migration required.

Summary

AI summary

Added version="v3" support in stream_events and astream_events

Changes in this release

Type	Severity	Summary	CVE
Feature	Medium	Adds support for version="v3" in stream_events / astream_events for langchain agents Adds support for version="v3" in stream_events / astream_events for langchain agents Source: llm_adapter@2026-05-21 Confidence: high	—

Full changelog

This release adds support for version="v3" in stream_events / astream_events for langchain agents. Refer to the event streaming guide for details.

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Earlier breaking changes

vlangchain-core==1.4.0 Deletes schema items marked for removal in schemas.py
vlangchain-core==1.4.0 Deletes function_calling.py utils marked for removal
vlangchain-core==1.4.0 Deletes get_relevant_documents function from API
vlangchain-core==1.4.0 Deletes pydantic_v1 module entirely from codebase
vlangchain-core==1.4.0 Deletes BaseMemory module, moved to langchain-classic