In a security updates post, Samsung lays out the devices that will get monthly, quarterly, and bi-annual updates. As recently spotted by 9to5Google, the S21 series will now be downgraded to quarterly updates.

Samsung has announced a change in its update schedule for the Galaxy S21 series, which includes the S21, S21+, and S21 Ultra models. These devices will no longer receive monthly security updates and will instead be shifted to a quarterly update cycle. Why did Samsung go ahead with this much cost cutting on Galaxy S25 Ultra

The good news is that the Galaxy S21 series was promised to receive up to four years updates, which means it will get an update to One UI 7. One UI 7 wasn't a traditional release by Samsung, coming much later than expected. But, it appears that the wait was well worth it for Samsung owners, as the update has seen rave reviews.

Samsung's Galaxy S21 series, including the S21, S21 Plus, and S21 Ultra, will now receive quarterly updates instead of monthly updates.

In a move that we’re now seeing on a somewhat set schedule, Samsung’s Galaxy S21 series has been dropped to quarterly updates. With this, owners of the Galaxy S21, S21+, and S21 Ultra should no longer expect monthly security updates,