Should I update???

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http://androidforums.com – Hello last night I rooted my phone and installed Jellybomb Domination 5.0. This morning I get a pop for a Andriod System Update that is 81mb. This is the message: This software update includes new enhancements and improvements for your Samsung Galaxy S III. You will be unable to use your device for the duration of the install, which is expected to take several minutes. My question is should I let the update go through. Someone told me it could brick my phone if I do but I wanted to make sure because the pop up is constant and rather annoying. Any help would be greatly appreciated. (General)