Samsung has pulled the plug on security updates for the Galaxy S8 and S8+. The devices were announced back in 2017, marking the beginning of smartphones with thin bezels. They had since enjoyed four years of Android security updates, although that has now come to an end.
On its security updates page (via 9to5Google), Samsung has removed the two flagship phones from the list of handsets that are receiving support. If you intend to keep your Galaxy S8, you'll have to cope with the current software version moving forward, knowing that it will no longer receive fixes or any form of updates.
While security updates for the legacy phones have ended, it's worth noting that the Galaxy S8 and S8+ continued to receive support for a longer period than Google's Pixel phones. Samsung managed to beat Google at its own game when it announced in February that it would roll out four years of security updates for Galaxy devices. In contrast, the Pixel devices receive only up to three years of security and feature updates.
Like most of Samsung's flagships, the Galaxy S8 lineup received two major OS updates and up to three years of monthly security updates before it was moved to the quarterly schedule early last year. Noticeably, the Galaxy S8 Active and S8 Lite are still receiving security updates under the quarterly and biannual schedules, respectively, since these were released a few months after the Galaxy S8 phones were launched.