ExpressionEngine 5 is at the tail end of its support life and will be completely retired at the end of this year (2021). Once retired, it will not receive any additional bug fixes or security patches, as designated on our Version Support page.
The good news is that ExpressionEngine Version 6 is an LTS (Long Term Support) release, and as such will be supported for 5 more years. It’s also an easy upgrade from version 5.
Learn more about why you should upgrade, or to get in touch with an ExpressionEngine Partner that specializes in upgrades today!