How to update fixes and patches?

Reinstalled version 3.0 and in the new version missing the "Check for updates" option.
how to update the latest patches?

Moto x pure security patches

Anyone know when Motorola is going to update the security patch level on the Moto x pure. The promise quick updates and all that stock Android stuff. But I think that Motorola does a pretty terrible job of keeping their update promises. Especially on a phone that's not even a year old yet. What's up with that? My moto x pure is stuck on the February security patch when other OEMs are already on June for older phones