https://www.gamespot.com/articles/new-pokemon-go-update-out-now-heres-what-it-does/1100-6456769/

Pokemon Go is celebrating Valentine's Day this week with a higher chance of catching certain Pokemon and earning extra Stardust. Alongside this special holiday event, Pokemon Go also received a new update.

Update 0.91.2 on Android devices and 1.61.2 on iOS was released today, announced on developer Niantic's Twitter account. It's a small update, and the iOS and Google Play stores haven't listed patch notes yet, but Niantic states that it focuses on fixing bugs.