Erro na utilizando react-router

No meu arquivo index.js te,m o seguinte codigo

import React from 'react';
import ReactDOM from 'react-dom';

import './css/reset.css';
import './css/timeline.css';
import './css/login.css'

import App from './App';
import Login from './componentes/Login'
import {Router,Route,browserHistory} from 'react-router';


ReactDOM.render(
  (
    <Router history={browserHistory}>
      <Route path="/" component={Login}/>
      <Route path="/timeline" component={App} />
    </Router>
  ),
  document.getElementById('root')
);

o no console do meu navegador apresenta o seguinte erro:

warning.js:36 Warning: Failed prop type: The prop history is marked as required in Router, but its value is undefined. in Router (at index.js:15)