# Docs by LangChain: Open source (Python)

> Markdown index of the Open source (Python) documentation.

## Open source (Python)

- [Changelog](https://docs.langchain.com/oss/python/releases/changelog.md)
- [What's new in LangChain v1](https://docs.langchain.com/oss/python/releases/langchain-v1.md)
- [What's new in LangGraph v1](https://docs.langchain.com/oss/python/releases/langgraph-v1.md)