Once you've installed Stamp, the application will periodically check for updates automatically, You'll be notified when a release of Stamp has been fully tested and is available for you to use.
At any time, you can choose to stop Stamp from checking for updates by unchecking the "Automatically check for software updates" box in Stamp's preferences, under the General tab.
In Stamp's About window, you can see a change log of what's new, fixed and has been changed. You can also find the same information at www.stamp.xyz/changelog