def update_gateway_software_now(GatewayARN=None):
    """
    Updates the gateway virtual machine (VM) software. The request immediately triggers the software update.
    See also: AWS API Documentation
    
    Examples
    Updates the gateway virtual machine (VM) software. The request immediately triggers the software update.
    Expected Output:
    
    :example: response = client.update_gateway_software_now(
        GatewayARN='string'
    )
    
    
    :type GatewayARN: string
    :param GatewayARN: [REQUIRED]
            The Amazon Resource Name (ARN) of the gateway. Use the ListGateways operation to return a list of gateways for your account and region.
            

    :rtype: dict
    :return: {
        'GatewayARN': 'string'
    }
    
    
    """
    pass
