what is the lowest version of osx I my i need to upgrade to so that my iphone 4s ios 8.3 wiil sync

Model Name: MacBook

Model Identifier: MacBook5,1

Processor Name: Intel Core 2 Duo

Processor Speed: 2 GHz

Number Of Processors: 1

Total Number Of Cores: 2

L2 Cache: 3 MB

Memory: 4 GB

Bus Speed: 1.07 GHz

Boot ROM Version: MB51.007D.B03

SMC Version (system): 1.32f8

My Mac above. I run mac osx 10.5.8 and have 10.6 Snow leopard to begin upgrade process.

What is the lowest version of mac osx that I can upgrade to and sync with my iphone 4s ios 8.3?

Many Thanks, mgm