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On Whonix-Gateway and Whonix-Workstation,
due to the Heartbleed bug in OpenSSL, you are advised to run:
sudo apt-get update && sudo apt-get dist-upgrade
as fast as possible.
Additionally, on Whonix-Gateway restart Tor:
sudo service tor restart
(or simply reboot).
(You only have to do this once. Otherwise do just regular upgrades.)
Hidden Services:
If you are using hidden services (TorChat, hidden web server, etc.), you should also create a new hidden service domain name, for more information, see:
https://blog.torproject.org/blog/openssl-bug-cve-2014-0160
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