X is raising prices for its top-tier subscription service by 37.5%, marking the largest price increase since the platform’s acquisition by Elon Musk in 2022.

The Premium+ service will cost $22 monthly in the U.S., up from $16, effective December 21, according to a company statement. Annual subscriptions will increase to $229 from $168.

X said it was “adjusting” the prices to support the experience it offers. Existing subscribers will be grandfathered into current rates until January 20.

International markets face similar increases, with European Union prices rising to €21 from €16 monthly. Canada will see Premium+ rates climb to $29 from $20.

Some markets are more impacted than most. X Premium+, which completely removes ads among other features, will cost users in Nigeria ₦34,000 monthly, up from ₦7,300. Users in Turkey, similarly, will have to pay ₺770 for the top-tier X service, up from ₺300 currently.

The platform’s basic subscription remains unchanged at $3 monthly.