Boost 1.70 io_service deprecation

I'm trying to migrate some old code from using io_service to io_context for the basic tcp acceptor, but am running into issues when switching get_io_service() to get_executor().context() results in the following error:

cannot convert ‘boost::asio::execution_context’ to ‘boost::asio::io_context&’

This is the listener:

ImageServerListener::ImageServerListener(boost::asio::io_context& io)
{
    _acceptor = new boost::asio::ip::tcp::acceptor(io, boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), sConfig.net.imageServerPort));
    StartAccept();
}

ImageServerListener::~ImageServerListener()
{
    delete _acceptor;
}

void ImageServerListener::StartAccept()
{
    std::shared_ptr<ImageServerConnection> connection = ImageServerConnection::create(_acceptor->get_executor().context());
    _acceptor->async_accept(connection->socket(), std::bind(&ImageServerListener::HandleAccept, this, connection));
}

void ImageServerListener::HandleAccept(std::shared_ptr<ImageServerConnection> connection)
{
    connection->Process();
    StartAccept();
}

What would have to be changed in order to return an io_context instead of an execution_context?