A new Pokémon GO update is now rolling out on iOS and Android, bringing the game to version 0.415.3. As is typical for incremental releases, the update focuses on general stability improvements, bug fixes and performance enhancements rather than major new gameplay features. Trainers can download the latest version through their device’s respective app store as the rollout expands worldwide. While no significant content additions have been announced alongside the patch, keeping Pokémon GO updated ensures access to the latest event features, gameplay improvements and backend changes as the game continues its busy schedule of seasonal content and live events.
Source: Official Pokémon GO support