webpack.DefinePlugin is not a constructor

Olá pessoal, tudo certo?

Depois de ter feito o curso da Alura sobre webpack, decidi ler a documentação. Cheguei em um ponto do qual ensina como injetar uma variável para ser acessada em runtime.

 plugins: [
            new webpack.DefinePlugin({
                SERVICE_URL: JSON.stringify(url),
            }),
 ],

Porém na hora de dar um npm start aparece o seguinte erro webpack.DefinePlugin is not a constructor

Para tornar o projeto disponível no navegador, estou usando o webpack-dev-server. Vou adicionar aqui meu package.json e webpack.config.js

PACKAGE.JSON

{
  "name": "learning-webpack",
  "version": "1.0.0",
  "description": "",
  "private": true,
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "webpack": "webpack --config webpack.config.js",
    "build": "webpack --env production && webpack --env development",
    "build-prod": "webpack --env production",
    "build-dev": "webpack --env development",
    "watch": "webpack --watch",
    "start": "webpack serve --open",
    "server": "node server.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "express": "^4.17.1",
    "html-webpack-plugin": "^5.3.1",
    "webpack": "^5.26.0",
    "webpack-cli": "^4.5.0",
    "webpack-dev-middleware": "^4.1.0",
    "webpack-dev-server": "^3.11.2"
  },
  "dependencies": {
    "lodash": "^4.17.21"
  }
}

WEBPACK.CONFIG.JS

const path = require('path')
const HtmlWebpackPlugin = require('html-webpack-plugin');
const { webpack } = require('webpack');

module.exports = (env) => {
    const folderName = env.production ? 'build-prod' : 'build-dev';
    const url = env.production ? 'www.prod.com' : 'www.dev.com';

    return {
        mode: 'development',
        entry: {
            index: './src/index.js',
            print: './src/print.js',
        },
        devtool: 'inline-source-map',//To show error bundles
        devServer: {
            contentBase: './dist',//the location that devServer should look for
        },
        plugins: [
            new webpack.DefinePlugin({
                SERVICE_URL: JSON.stringify(url),
            }),
            new HtmlWebpackPlugin({title: 'Caching'}),
        ],
        output: {
            filename: '[name].[contenthash].bundle.js',
            path: path.resolve(__dirname, folderName),
            clean: true, //It cleans '/dist' folder before a new build
            publicPath: '/', //The publicPath will be used within our server script as well in order to make sure files are served correctly on http://localhost:3000. The next step is setting up our custom express server
        },
        optimization: {
            moduleIds: 'deterministic',//despite any new local dependencies, our vendor hash should stay consistent between builds:
            runtimeChunk: 'single', //to create a single runtime bundle for all chunks
            splitChunks: {
                cacheGroups: {
                    vendor: {
                        test: /[\\/]node_modules[\\/]/,
                        name: 'vendors',
                        chunks: 'all'
                    },
                },
            },
        },
    }
}

Procurei soluções na internet, mas não tive muito sucesso.

Agradeço desde já qualquer ajuda ou comentário!