---
title: What's new in Keyman Developer 19.0
---

Keyman Developer 19 has the following significant changes:

- Updated to Unicode 17.0 (#14728)
- Updated langtags.json, ISO639-3, language-subtag-registry (#16371)
- Validate a keyboard or lexical model project frmo within Keyman Developer (#16076)
- Support for line numbers in LDML keyboard compiler messages (#13375)
- Convert from .keylayout (macOS keyboards, Ukelele) into .kmn (#12191)
- Compiler improvements - prevent illegal constructs (#16723, #16726, #36710, #16717)
- Various improvements to touch layout editor (#16572, #16520, #16517, #16516, #16509, #16456, #16370, #16347, #16129, #15371, #15338, #15243, #15060, #14228)
- Support output folder and `--continue-on-error` in kmc (#16453)
- About [400 other fixes and changes](https://keyman.com/go/app/whatsnew/developer/19.0)