Development license key not valid

Hello,
We get this error message:
Your license maintenance does not cover the Flexmonster version you are using. Please renew your maintenance to stay on this version.

Maintenance expiration date: 04/23/2023
Supported versions: ≤ 2.9.48
Current version: 2.9.61 (build 10/02/2023)

We would like a development key updated.
Thank you