According to Footnote management:
This slight increase will help us to continue to add more valuable content to Footnote and make things easier to find and use.However, there is a silver lining. Those considering a Footnote membership or current monthly members can upgrade (right now through the end of July) to an annual plan for $59.25 - a $20 discount off the new price.
Even those who are already annual members can take advantage of the special offer and extend their memberships for an additional 12 months at the reduced rate.
For more information, click here.