Iphone 6s and not being able to sync to itunes
I just recently got the Iphone 6s and I am unable to connect this phone to my Itunes. It is due to my OS X version being too old (10.6.8). I can't seem to update it to a newer version. I need the newest version of itunes and in order to update that I need to update my OS X to a newer one. How can I do so? Or is there away around this so I can sync my phone with Itunes!
I have an older Macbook (probably around 2007) if that info is needed.
iPhone 6s, iOS 9.3.5