System update notification but system already up-to-date I've had the Google Pixel XL for over a year now (it's awesome) and I just received a notification to upgrade my OS to 8.1.0. Problem is, I already have 8.1.0 installed. I updated it a couple weeks ago. What is going on here?

This is also not the first time this has happened. I haven't been keeping track of when it's occured, but the same thing happened with 8.0.0 as well as a couple other times. Each time I've just went forward and reinstalled the udpate that I already had.

From what I can tell, there is no way to dismiss the notification and ignore the redundant update. I know that I could disable the system update notifications altogether, but I would like to have them, only just the first one.

This is not a major huge deal, but I'd be curious to know if people have thoughts about this. Thank you.
Does Android put out security updates with the same version #?


Yes. Version number changes generally correspond with new features or new APIs. Occasionally it will also be incremented for major bugfixes, but this has been somewhat less common now that Google has tried to increase their release cadence (around Android 6.0-ish or so). Security updates will change the build number, but not the version number. See the list of factory images for your device for an example of this (note all the repeated version numbers, followed by build IDs). 



If you go to Settings > System > About phone you can find the "Android version" (circled blue below) and the "Build number" (circled red) of your current system. You can also check the "Android security patch level" on this screen to determine which security update you've received. They generally occur during the first week or so of each month, and they are outlined in the monthly security bulletins. Most likely you're receiving a notification for the January security update.


Picture from https://wccftech.com/android-oreo-for-verizon-pixel/