The 14.21.0 release (at least) says: > [[18c43c8518](https://github.com/nodejs/node/commit/18c43c8518)] - deps: update timezone to tz2022e (Richard Lau) https://github.com/nodejs/node/pull/45094 Version 2022f was released on October 29th: http://mm.icann.org/pipermail/tz-announce/2022-October/000075.html It includes an update to Mexico DST that already took effect October 30th. The ICU repository was just updated to include the binary files 5 hours ago: https://github.com/unicode-org/icu-data/tree/main/tzdata/icunew/2022f/44