I spent the last few years working for 2 different auto insurance companies. Call your insurance company, based on your zipcode you're rates can go up or even DOWN, you might even be closer to work. If you aren't closer to work you can fudge a little and say that your work is less than 3miles away (thats pleasure usage, the cheapest usage).
Edit: You HAVE to change it. Renewal periods they run history checks and will find the new address you were holding out on and the date you changed it. You could have your insurance non-renewed for that.