proportions of a population are different in knn method

I have a dataset that have 3 types (classes). You can imagine it is iris dataset. But in the original dataset, it has 50-50-50 observations for each class. So the proportions are 1/3=1/3=1/3. What if the class of new observations collected from an area where the class proportions have changed to 0.5, 0.2 and 0.3? Suppose I am using KNN method to predict. Do I need to adjust anything?

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