Message: 3.1.15 has released! ???

Why do I get this message on the admin side?

Upgrade yor database for new version of WP Event Manager

3.1.15 has released! We are constantly working to improve your event management experience, We have a new release focusing on a handle of fixes and updates & here is a summary of what has been improved… Manage your Organizers directly at the frontend and backend. Migration of Old Organizer data would be transferred to the list Automatically. A prior Backup does no harm before updating the plugin! .