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You should not update the prop from the children component :
All props form a one-way-down binding between the child property and the parent one: when the parent property updates, it will flow down to the child, but not the other way around. This prevents child components from accidentally mutating the parent’s state, which can make your app’s data flow harder to understand.
In addition, every time the parent component is updated, all props in the child component will be refreshed with the latest value. This means you should not attempt to mutate a prop inside a child component. If you do, Vue will warn you in the console.
You can read more about it here
If you have no other solution than updating if from the children component, it might be worth thinking about a different data flow strategy or design. (Components Basics)