That's your Max altitude for uav (120m).
Don't be silly and go higher or you will just make life harder for yourself and everyone else.
I understand the safety concern, so I won't argue that, but let me ask you a hypothetical question.
Let's say you bring your car in for a recall to fix a faulty airbag and when you get the car back they mention that they've also capped the car's speed at 65 MPH. Would you be happy?