ExpressionEngine 2 was released in 2009 and retired in 2017. ExpressionEngine was retired in 2018. To keep your website current with security patches, you have to upgrade your CMS to the latest version.
With new versions of ExpressionEngine come support for newer versions of PHP which will allow your website to run much faster and take advantage of new features. PHP 5.6 was End of Life (EOL) in 2018. For PHP, EOL means that it will not receive any security updates. That's a huge issue that attackers could possibly take advantage of.
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Why Upgrade Your Website?

Speed
If your website is running ExpressionEngine 2, there's a very good chance that it's running an outdated version of PHP. After a successful upgrade, you can run your site from a server using the latest version of PHP and not only will it run faster, you may be able to use a smaller server plan and save money every month!
Security
Out of the box, ExpressionEngine is one of the most secure CMSs on the market, but the team at ExpressionEngine patch any possible security issues shortly after they are found. That's why it is so important to keep the CMS updated whenever a new release is announced.


New Features
It sound obvious but a newer version, may bring new features! Some of the recent features include:
- native Grid and Relationship Fieldtypes
- a Fluid Fieldtype that gives user more flexiablity when creating content from within the CMS
- improved Live Preview feature
Long Term Support (LTS)
ExpressionEngine 6 guarantees long term support! What does that mean? For 5 years ExpressionEngine will not have any site-breaking changes when updates are preformed. This means that updates will be easier to do than in years past.
