https://www.gamespot.com/articles/pokemon-go-update-out-now-heres-what-it-does-not-m/1100-6455149/

Niantic has rolled out another update for Pokemon Go. The new version, 1.53.2 for iOS and 0.83.1 for Android, makes a few minor improvements to the popular mobile game, most notably if you own the new iPhone X.

Along with various bug fixes, the version 1.53.2 update optimizes Pokemon Go for the iPhone X's screen resolution. Niantic has also removed support for older devices that are still running iOS 8.