However, Amazon US aren't raising the price of the annual fee - which still stands at $99. It also handily points out if you bite the bullet and pay the $99 yearly fee all up front, pricing will stay the same.
Amazon Prime customers in the U.S. will now have to pay $12.99 (£9.37) a month for the service after the tech giant bumped up prices from $10.99. Since then, Prime membership growth has been the strongest among households making less than $50,000 annually, an R.W. Baird study found. This price increase also means that those who unwisely choose to pay for a full year at the monthly rate will spend $156 instead of the previous $132.
Amazon gave no specific reason for the price increase.
Amazon Prime is getting more expensive for monthly subscribers. We should note, though, that it doesn't include access to Prime's other benefits - free two-day shipping, access to the Amazon Prime Music library and other perks.
That isn't the only membership fee rising, either.
Forrester analyst Brendan Witcher said "when compared to similar offerings in the market, the $10.99 monthly Prime offering was priced too low". The company said items shipped with free one-day, same-day delivery or Ultra-Fast deliveries with Prime Now more than doubled this holiday season.
Express.co.uk has contacted Amazon to ask if customers in Britain will also see a similar increase.
The cost builds come as Morgan Stanley sees signs that Amazon Prime's development is beginning to moderate.