Telegram is actively forcing the apps to update because of transition to 64-bit chat IDs.

I recommend to everyone who receives "Please update Telegram to the latest version" error to update to beta version 1.4.4 or to temporarily use other updated apps.

In the coming days I hope to release stable version on same TD sources as 1.4.4.

After the stable release it's important to release another one. Telegram has introduced sponsored messages (or to put it simply, advertisements) in the public channels who have more than 1000 subscribers. Support for these messages in apps must be done before January 1, 2022, otherwise there is a risk of ban for app by API ID.