You don't have to upgrade to every version that is released, unless your product is affected by a fixed bug (or performance improvement). jQuery isn't exactly a system library that could have a security hole making your web server exploitable remotely.

Unless of course "VWO" (you should provide a link or descriptive text when mentioning a TLA we might not recognise, BTW) is somehow sensitive to what version other people use on their sites so you have to test against all versions.