If you're server is using item economy's, it is recommended to update since this fixes a issue which could be exploited by players using item economy's.
Note, if you're still using a old plugin version below v5 and want to update, see our simple guide on how to migrate your shop data here

Fixed:

• Exploit using item economy's
• Editing item prices using GUI Editor on 1.20.2 servers

Changed:

• Using different Json libary which allows servers below 1.17 to add item economy's using commands