Realme has released September 2021 Security patch for Realme 5s. Similar to Realme 5i and Realme 5 this device is getting security patches with August & September 2021 integrated along with system stability improvements.
Realme 5s was released on November 2019 with Android 9.0 out-of-the-box
Realme 5s got upgraded to Android 10 with Realme UI. It is supposed to get an Android 11 update with Realme UI 2.0 but, According to Realme, there is no testing or confirmation for the same, they are trying to roll updates to newer models first and have kept 5s,5i & 5 users in suspense.

Source: Realme community
| Android OS | Update | Release Date/Status | Estimated Months |
| Android 9 Pie | Out-of-the-box | November 2019 | Nil |
| Android 10 | First OS update | October 2020 | 11 months |
| Android 11 | Last OS update | Expected | No confirmations |
The Realme 5s has received one major OS update with Android 10.
Hence, the Realme 5s Android 11 Update is the last major OS update(expected) on this device.
Once the update is available on your device, you can head over to Settings >> About Phone >> Software Update section to update your Realme device with the latest security/software update.
For more Realme Android updates please download our Android App – Available on the Play Store