Hello,
Update to wordpress new version is a one click work. You can do that yourself. I can show that if you want to do that yourself.
But problem is to fix any issue created after wordpress is updated. Hope to do anything it needs if you award me the project. I have big profile in other online marketplace, but started in here, so i need work, no matter the budget, so here you have an opportunity to get your work from an expert.
For any suggestion, i'm here on skype. Skype id: lablu007
Thanks.