All the Office applications should be at version 15.0.4569.1506 or higher, as of date.Regardless of the version of Microsoft Office Suite that is installed on your computer, it's important to keep your suite up to date.
For example, This is the case or everything within office 2013 has not been updated.
I will give you two options that you can use to check for and install free updates.
This option only works for office 20 and will require that you have Internet Explorer installed.
If you don't see an expected Mac update: Learn how to upgrade to the latest mac OS version, which includes the latest version of Safari and the Mac App Store.
You can set your App Store preferences to ”Download newly available updates in the background.” If you're using OS X El Capitan v10.11.5 or later, these updates include major new mac OS versions, such as mac OS Sierra.
In case you have not yet installed Office 2013 Service Pack 1 yet, you may also receive some updates.