All Whonix users:
The Whonix team would like to thank each and every community member for all the hard work that was put into supporting Whonix 13 over that last 2 years. Through your efforts, Whonix 13 was a great success and by and large surpassed all expectations.
With the recent release of Whonix 14, a hard decision needed to be made about the feasibility of continued Whonix 13 support. Under ideal circumstances, Whonix developers would continue to support Whonix 13 for an extended period. Unfortunately, due to limited human resources Whonix 13 is due to reach EOL on September 30, 2018. On this date, Whonix 13 will be deprecated and no longer receive security updates.
Although Whonix 13 reaches EOL in 30 days, users should not be alarmed as it is still safe to use until that time. That said, it is strongly encouraged to upgrade to Whonix 14 sooner rather than later, to ensure there is ample time for a smooth upgrade.  If users encounter any problems, please follow the footnoted instructions to submit a support request. 
Whonix 14 release announcement: