You can change it in 2 ways,
(1) For iOS and Android Both :
- Build Setting -> Player Setting - > Other Setting ->
Then go to Identification Tab and you can change your build version ( you have to increase version number with older+1 ).
(2) For iOS Only : You can set it from Xcode also ,
-> Open your project in Xcode
-> Select Targets ( click on your app/game )
-> Goto General Tab
-> In Identify Column you have to specify your Version number and Build number (set those with value older + 1).
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