How to enforce strong passwords with Membership plugin

I am using Membership plugin and have a free membership level setup where users are required to entire an invite code in order to join.

I noticed that the registration page does not force strong passwords and that a person could simply just put a single letter in as a password and that gets accepted... Is there any way I can enforce users to enter strong passwords?

Also is there a way to have membership users update their passwords every 6 months?

Thanks in advance!