langchain-upgrade-migration

By jeremylongshore. Updated August 19, 2026. Categories: Automation Tools.

Migrate a LangChain 0.3.x Python codebase to LangChain 1.0 / LangGraph 1.0 without breaking production — named breaking changes, codemod patterns, and a phased rollout. Use when upgrading LangChain or LangGraph from 0.2 or 0.3 to 1.0, when hitting ImportError after an upgrade, or when preparing a migration PR. Trigger with "langchain 1.0 migration", "langchain upgrade", "LLMChain removed", "initialize_agent removed", "ConversationBufferMemory removed", "astream_log deprecated", "langchain-anthropic 1.0".

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