Google has released the latest security patches for the Android 7.1.2 operating system. If you have a Nexus 6P or Nexus 5x watch for update notification.
Android 7.1.2 May 2017 Security Patch Released
This update size is around 37 mb for the Nexus 6P and could vary based on your Nexus model.
Google has released this month’s i.e May 2017 Security patches a little earlier than usual.
So, If you have an Google Nexus Android phone you may have been already prompted for an update or just head to the About -> System Updates -> Check for Update and it’ll trigger an update.