[Release] langchain-ai/langchain langchain==1.3.9: langchain==1.3.9

LangChain version 1.3.9 has been released with updates to the Anthropic integration (1.4.6) and security improvements. The release includes a fix that confines file-search results and tightens the `allowed_prefixes` configuration for Anthropic, enhancing security and control over file access patterns. This is a minor patch release following version 1.3.8.

Key Points

• •LangChain updated to version 1.3.9 with corresponding Anthropic integration update to 1.4.6
• •Security fix implemented to confine file-search results, preventing unintended file access
• •Anthropic `allowed_prefixes` configuration tightened to restrict file path patterns
• •Changes focus on improving security boundaries between LangChain and Anthropic integrations
• •Patch release addressing integration-level security concerns rather than major feature additions

Workflow Diagram

Concepts