Can't change theme on the fly

I was trying to dynamically set editor theme and it doesn't work, if I set it like this
const editorTheme = useMemo(() => {
        return isDark ? 'ace/theme/ambiance' : 'ace/theme/chrome';
    }, [isDark]);
    
theme={editorTheme}
it's not working, it just picks up the first theme in condition, how can I change it when toggling between dark and light modes of the app?