# Why isn’t my 3- license key working?

When attempting to enter your license key into Portainer Business Edition, that starts with 3-, you may encounter the following error message:

`License is invalid`

#### Cause

This issue arises when using versions of Portainer 2.18.3 or older. These previous versions do not support the 3-  license key type. 

#### Fix

To resolve this problem, upgrade your Portainer version to 2.18.4 or newer. See our [upgrade instructions](https://docs.portainer.io/2.33-lts/start/upgrade).