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v2.1.61 Claude Code Release Notes

Feb 26, 2026
Claude's Analysisby Sonnet 4.6
Full Analysis

Fixes a race condition that corrupted Claude Code's config file when multiple processes wrote simultaneously on Windows.

Change
1
Total Changes (vs Average)
0.1×
Version Type
Patch
Release Focus
Bug Fix
Day Since Prior Release
1
Release # This Month
#26 of 28
Bug Fix Ratio
100%
Post-Release Edits
—
Change Category
Ecosystem Impact
Windows has appeared in 5 of the last 10 releases, reflecting sustained parity work. Config integrity joins prior concurrent-use edge case fixes, suggesting complex multi-process scenarios on Windows continue to surface reliability gaps.
Key Themes
1Config File Integrity on Windows
May Help If You've Noticed
Your Claude Code settings reset or disappear after running multiple operations at once on Windows
Config file becomes unreadable and Claude Code fails to start correctly on Windows
Settings changes don't persist when using Claude Code with parallel or overlapping tasks on Windows

Changes in Claude Code v2.1.61

Fixed1 change

  • •Fixed concurrent writes corrupting config file on Windows

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