React Redux state changes

this.props.authStateremains the same, although I dispatch an action in the componentDidMountfunction :

componentDidMount() {
      if (localStorage.getItem('token')) {
        dispatch(updateAuthState('AUTHENTICATED'));
      }
  }

render() {
 <div>{this.props.authState}</div>
}

Home.propTypes = {
    authState: PropTypes.string
};

const mapStateToProps = (state) => {
    return {
        authState: state.authState
    }
};

const mapDispatchToProps = (dispatch) => {
  return {

  }
};

export default connect(mapStateToProps, mapDispatchToProps)(Home);

The output is NO_AUTH (initial value of authState)

reducer:

export function authState(state = "NO_AUTH", action) {
    switch (action.type) {
        case 'AUTH_STATE':
            return action.authState;
        default:
            return state;
    }
}

Any idea why?