Book a demoLog inStart for free
  • CLI reference
    • Get started with Fern CLI
    • Global options
    • Commands
    • Changelog
CLI reference

Changelog

March 7, 2026
March 7, 2026

4.15.3

(fix): Fix fern generator upgrade failing with ENOENT on package.json when multiple CLI processes run concurrently (e.g., in parallel tests). A cross-process file lock now serializes npm installs to the shared ~/.fern/migration-cache prefix, preventing concurrent install races.

Was this page helpful?
Edit this page
Previous

Changelog

Next

March 6, 2026

Built with
LogoLogo
Book a demoLog inStart for free