Will updating Iphone 3GS to ioS 6.0 ruin screw up my jailbreak?

I don't know how to ask this… Sorry if my wording makes no sense.

I have an Iphone 3GS, and I want to update it iOs 6.0, but won't that take the jailbreak or whatever off? And I will have to jailbreak it again?

Yes, but I doubt a 3GS can update to iOS 6.

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