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Changelog

October 16, 2026
Improved

Added support for Bun canary builds

Render now supports canary builds for Bun. Canary builds let you preview upcoming Bun features before they reach a stable release.

To use canary builds, do one of the following:

  • Set your service's BUN_VERSION environment variable to canary.
  • Add a .bun-version file to the root of your repo with the single line: canary.

Don't use Bun canary builds for production services. Canary builds are untested pre-releases. Learn more about setting your Bun version.