mercury 10 upgrade

[olijam]

I have a mercury 2 stroke,10 hp outboard, model 10ML, Ser.no. OP444063,year of manufacture 2006. I am not sure it is a viking,sea pro, or a marathon model.
As I find it a bit underpower for my 13 foot boat,I would like to upgrade it to 15 hp.
Can you please advise what components I need to replace,possible with parts references.
Thanks