Apple today released Security Update 2016-001 for OS X El Capitan users, introducing important security fixes to the operating system. Apple has also also introduced Security Update 2016-005 for OS X Yosemite users.

The Security Updates are available to all OS X Yosemite and El Capitan users and can be downloaded from the Mac App Store. Apple recommends all users install the update, and a full list of what’s fixed can be found in the accompanying support document.

Most security updates are generally built into OS X updates as they are released, with separate security-only updates only being introduced when standard updates to the operating system are not expected. The release of a Security Update for OS X El Capitan suggests we may not see any new versions of the operating system ahead of the launch of macOS Sierra.
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Source: MAC ROUMORS