How to update child component data?

Question

Vue.js

Hey! Can you tell me how to update the data in the child component after ajax loading the data?

<widgetLocationSelector
:country="form.country"
:city="form.city"
@changeCountry="changeCountry"
@changeCity="changeCity"
></widgetLocationSelector>

AT

created: function () {
  // после ajax
this.form.country = response.country
}

not updated