Members Status is pending even though payment was made

I have a member on a recurring monthly subscription to a membership via Stripe. His last payment was automatically charged by Stripe and the charge was completed successfully on December 14th. However in the Membership plugin his subscription is showing as Pending (activate on next payment). How can I get it to sync with Stripe so it sees that the members has in fact paid. This has been an ongoing issue for some members, though it doesn't happen for everyone.