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langchain==1.2.13

LangChain Releases / 3/20/2026

📰 NewsDeveloper Stack & InfrastructureTools & Practical Usage
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Key Points

  • LangChain released version 1.2.13 with changes since 1.2.12, including pull request #36111.
  • The CI workflow now suppresses pytest streaming output to reduce noise in CI (#36092).
  • A new LangSmith integration metadata feature has been added to create_agent and init_chat_model (#35810).
  • Dependency-related lint optimizations include avoiding unnecessary dependency installs in lint targets (#36046).
  • Chores include bumping pyasn1 from 0.6.2 to 0.6.3 and pyjwt from 2.10.1 to 2.12.0 in libs/langchain_v1, and there is a fix to export Runtime from agents.middleware (#36029,#36024,#35975).

Changes since langchain==1.2.12

release(langchain): 1.2.13 (#36111)
ci: suppress pytest streaming output in CI (#36092)
feat: Add LangSmith integration metadata to create_agent and init_chat_model (#35810)
ci: avoid unnecessary dep installs in lint targets (#36046)
chore: bump pyasn1 from 0.6.2 to 0.6.3 in /libs/langchain_v1 (#36029)
chore: bump pyjwt from 2.10.1 to 2.12.0 in /libs/langchain_v1 (#36024)
fix(langchain): export Runtime from agents.middleware (#35975)
chore: bump locks, lint (#35985)
fix(openai): add type: message to Responses API input items (#35693)
chore: bump black from 25.11.0 to 26.3.1 in /libs/langchain_v1 (#35802)
chore: bump orjson from 3.11.5 to 3.11.6 in /libs/langchain_v1 (#35807)
chore(langchain): add baseten to _BUILTIN_PROVIDERS (#35777)

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