We are pleased to announce the release candidate for Unicode® ICU 77. It updates to CLDR 47 (alpha blog) locale data with new locales, and various additions and corrections.
ICU 77 is mostly focused on bug fixes, segmentation conformance, and other refinements.
The Java technology preview implementation of the CLDR MessageFormat 2.0 specification has been updated to incorporate the CLDR 46.1 spec plus most but not all of the CLDR 47 changes.
The C++ technology preview implementation of MessageFormat 2.0 is not yet quite up to date with CLDR 46.1.
For details, please see https://unicode-org.github.io/icu/download/77.html.
Please test this release candidate on your platforms and report bugs and regressions by Monday, 2025-mar-10, via the icu-support mailing list, and/or please find/submit error reports.
Please do not use this release candidate in production.
The preliminary API reference documents are published on unicode-org.github.io/icu-docs/ – follow the “Dev” links there.