Sites made with CMS will have to be updated frequently:

• From then CMS
• From the template
• From the plugins

How do I know when I have to do an update?

In the showcase of the site there are always warnings about the updates you should do. But the admins also receives an warning email when an update is available.

Why is important to update these sites?

Because every outdated item of the site can be easily hacked, so it's always important to update as soon as possible the CMS, the templates and the plugins when it is possible.