prevent 98.18.78 update

[Blufx]

I have a Motorola droid razr m model XT907. It's rooted and GSM unlocked. I'm using it on Straight Talk currently. Verizon is pushing this 98.18.78 update which I hear unroots the phone. I want to know which of the verizon apps I need to freeze or remove to prevent this update.
Thanks in advance