You can update by clicking the "shield" icon in the system tray, then click the "Refresh" button, then once refreshed, click the "Install Updates" button .. once finished, REBOOT.
Another method is via the command line by running these commands in sequence:
sudo apt-get update
sudo apt-get dist-upgrade
Once the upgrade has completed, it's VERY IMPORTANT you reboot your machine(s). Once rebooted run:
This is to check you're now running the 4.4.0-36 kernel.
This kernel fixes the 8 known vulnerabilities listed here:
Peppermint 3 and 5 will both receive patched kernels, but...
There has been no updated kernel released upstream for the lts-utopic kernel used in Peppermint 6 .. if you're worried about these vulnerabilities we'd suggest you move to the lts-xenial kernel via the LTS Enablement Stack:
If you're using Peppermint 6 and require assistance, please ask on the forum:
where we'll be happy to help.
Please check out his other jaw dropping work, links can be found in the Peppermint 7 release announcement:
and his Google+ page (photos):
Peppermint was designed to be easy on your processor and system resources so you can get going and get things done...
Peppermint boot to under 250MB RAM, and is easy to run as a Live CD or USB. Loads and Shuts down in Seconds...
Peppermint offers Step-by-step installation, Works out of the box, Easy to Navigate with Automatic Updates....