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Thursday, July 30, 2026

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[Release] langchain-ai/langchain langchain-core==1.5.3: langchain-core==1.5.3

github-actions[bot]Jul 30, 2026

langchain-core version 1.5.3 has been released with a critical bug fix that enables fallback to the LANGSMITH_API_KEY environment variable for gateway authentication. This patch release addresses an issue where the gateway authentication mechanism was not properly falling back to the LANGSMITH_API_KEY when the primary authentication method was unavailable. The fix ensures more robust authentication handling for users integrating with LangSmith gateway services.

  • langchain-core 1.5.3 is a patch release following version 1.5.2
  • Primary fix: Gateway authentication now falls back to LANGSMITH_API_KEY environment variable
  • Improves authentication robustness for LangSmith gateway integration
  • +3 more key points...
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