Update Your SSH Keys on Github

Honestly, it’s probably good to get into the habit of updating your SSH keys regularly anyway, but in case you needed a reminder:

Back in February, we improved the security audit trail for SSH keys. Soon, organizations will be able to block access for SSH keys that were created prior to those improvements. If your application relies on deploy keys or user keys for repository access, we recommend replacing any keys created before February 24, 2014.

Read on Github Developer