Each time I revisit the Gravity Forms download page, there have been one or more minor version increments, but my installation does not update itself. I need to remove and re-add the plugin (which, fortunately, maintains form and entry data since I did not use the “Uninstall” feature).
I can’t find the specific link to the page that explains how Gravity Forms automatic updates work at the moment, but basically they ship a bunch of patch releases and make it available via GravityForms.com. Once that code has been out there a while and had more production-run hours under its belt, it’s tagged for automatic update.