Hi Gavinash,

first you have to upgrade your Domino server and if that's finished you can upgrade your Traveler application.

If your users got the devices clients from the server, they all receive a upgrade notification. If your users got the Traveler ( IBM Verse ) application from the Apple or Play store, upgrades are periodically

Note: When you have decided to run in HA mode, you can also upgrade your DB2 database scheme manually before upgrading Traveler. But if you are running without DB2, never mind my note ! 

Gavinash, 

You can also upgrade the Domino server to 901 FP7 as it is also out now. But we have a known issue on Linux 64-bit as I've observed that your platform is "Linux".  Make sure that you apply Traveler 9.0.1.14 when upgrading Domino to FP7. 

Reference: https://www.ibm.com/developerworks/community/blogs/LotusSupport/entry/Traveler_90114?lang=en

Although, there is no necessity to upgrade Domino at all if you want to upgrade Traveler. Domino upgrade is just optional if you want to upgrade Traveler to a later code. I recommend you upgrade to 9.0.1.14 since iOS 10 will only be supported starting 9.0.1.13 and later releases of Traveler