How to change a value inside a third party library

(You don't need to know android to help solve this question)

I am using a third party library in my android app. Call it libX. libX has a class named Constants in which they keep a number of constants. One such constant is used all over inside the library. But I need the value of that constant to be different from what it is. How do I change the value of that constant?

As illustration: I want to change the value of badConstant from “I am too bad” to “I am good”.

class Constants{
  public static final String badConstant = “I am too bad”;
}

I am open to any sort of creative solution. The thing is if I had a setter/constructor for the value all would be well. But right now there is no setter.

Also this library is obtained as a gradle dependency (if you care)