I am trying to create random numbers after clicking the button. it works in the console but not on the UI. Need help with this. I am missing something

    import 'dart:math';
import 'package:flutter/material.dart';

class RandomNum extends StatefulWidget {
  const RandomNum({super.key});

  @override
  State<RandomNum> createState() => _RandomNumState();
}

Random random = Random();
int randomNumber = random.nextInt(10);

class _RandomNumState extends State<RandomNum> {
  void randomNumberFunction() {
    setState(() {
      Random random = Random();
      int randomNumber = random.nextInt(10);
      print(randomNumber);
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Column(
        children: [
          Text(randomNumber.toString()),
          ElevatedButton(onPressed: randomNumberFunction, child: Text('Guess'))
        ],
      ),
    );
  }
}