Can I rejailbreak my Iphone?

I'm currently running IOS 5 jailbroken and I'd like to keep everything, but update it to IOS 6. If so, can someone tell me how or send a link?
Thanks!

Added (1). If not, then is it safe to rejailbreak it on the same version?

Updating to newer versions of iOS will remove your jailbreak, that's just how it is. So if you update to iOS 6 you will have to rejailbreak it and reinstall/resetup everything how you had it before.

P.S. This assumes there's a jailbreak for the newest iOS. I don't know if there's.

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