Yes, of course!
To upgrade your subscription:
- Go to wondery.com/plus-members and sign in if necessary
- Select "Manage Account" from the top half of the page
- Select the "Subscriptions" tab in the pop-up that displays
- Below "Wondery Plus Monthly", select the "Change plan" link
- Select "Wondery Plus Annual" then hit "Confirm and change my plan"
Note that when you upgrade, you will be charged the Annual price immediately and your subscription will be extended for one year past the end of your current subscription term.