As of July 19, 2016, Fedora 22 has reached its end of life for updates and support. No more updates, not even security fixes, will be provided for Fedora 22. Fedora 23 will be maintained with updated packages until approximately one month after the release of Fedora 25.
Upgrading to Fedora 23 or Fedora 24 is highly recommended for all users still running Fedora 22. For more information on upgrading Fedora, check out the DNF System Upgrade page on the Fedora Project wiki.
About the Fedora Release Cycle
The Fedora Project community provides updated packages for a Fedora release until about a month after the second following release. For example, updates for Fedora 23 continue until about a month after the release of Fedora 25. Fedora 24 continues to be supported until approximately one month after the release of Fedora 26.
The Fedora Project wiki contains more detailed information about the entire Fedora Release Life Cycle. This page includes how each version of Fedora progresses from development, to release, to post-release support, to end of life.