The support for Anniversary Update (version 1607) has ended on April 10, 2018, for Windows 10 Pro and Windows 10 Home. This means that these editions will no longer receive monthly maintenance and security updates. The last update for this version is KB4093119 that fixes a number of issues and security problems, and it bumps the build number to 14393.2189.
However, Windows 10 Enterprise and Windows 10 Education will continue to recieve updates for an additional six months – until October 10, 2018.
If you’re still running the Anniversary Update, you’re recommended to upgrade as soon as possible to a newer supported version of Windows 10.
These are steps to upgrade to version 1803 (when it becomes available), but the instructions works to upgrade to the latest release available at that moment (at the time of this writing is the Fall Creators Update).