Update Prestashop

I'm looking for someone to help me update my Prestashop store. There is no need for customizations; rather, I'm simply looking for help with the upgrade. Currently the website is in 1.7.5.0 version and I need to update to last version. In addition it has a Venedor template installed. I also need to make it works with last Prestashop version.
This isn't an ongoing project; I just need help with the update itself, and no additional support or maintenance services are required.