Claude Code 2.1.49 release notes

Version

2.1.49

Released

19 February 2026

Status

Stable release

What's new in Claude Code 2.1.49

The official notes for Claude Code 2.1.49 list 20 changes: 9 fixes, 5 performance improvements, 1 security change and 5 other changes.

• 9 fixes
• 5 performance improvements
• 1 security change
• 5 other changes

Highlights

• security change Added ConfigChange hook event that fires when configuration files change during a session, enabling enterprise security auditing and optional blocking…
• performance improvement Improved performance in non-interactive mode (-p) by skipping unnecessary API calls during startup
• performance improvement Improved performance by caching authentication failures for HTTP and SSE MCP servers, avoiding repeated connection attempts to servers requiring auth
• performance improvement Improved startup performance by caching MCP auth failures to avoid redundant connection attempts
• performance improvement Improved startup performance by reducing HTTP calls for analytics token counting

Our short summary: changes are counted and classified automatically from the official notes, and highlights are shortened. The complete, authoritative list is in the official release notes on GitHub.

Full release notes on GitHub (Claude Code 2.1.49)

All Claude Code release notes · All releases

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