Python 3 Error when running 'localstack infra'

When running localstack on Mac OSX via Python 3.6, I get this error upon start of the gateway service:
ERROR:localstack.mock.generic_proxy:Error forwarding request: HTTPConnectionPool(host='127.0.0.1', port=4585): Max retries exceeded with url: / (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x11184bfd0>: Failed to establish a new connection: [Errno 61] Connection refused',))
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/requests/packages/urllib3/connection.py", line 142, in _new_conn
    (self.host, self.port), self.timeout, **extra_kw)
  File "/usr/local/lib/python3.6/site-packages/requests/packages/urllib3/util/connection.py", line 98, in create_connection
    raise err
  File "/usr/local/lib/python3.6/site-packages/requests/packages/urllib3/util/connection.py", line 88, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [Errno 61] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/requests/packages/urllib3/connectionpool.py", line 595, in urlopen
    chunked=chunked)
  File "/usr/local/lib/python3.6/site-packages/requests/packages/urllib3/connectionpool.py", line 363, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1239, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1285, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1234, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1026, in _send_output
    self.send(msg)
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 964, in send
    self.connect()
  File "/usr/local/lib/python3.6/site-packages/requests/packages/urllib3/connection.py", line 167, in connect
    conn = self._new_conn()
  File "/usr/local/lib/python3.6/site-packages/requests/packages/urllib3/connection.py", line 151, in _new_conn
    self, "Failed to establish a new connection: %s" % e)
requests.packages.urllib3.exceptions.NewConnectionError: <requests.packages.urllib3.connection.HTTPConnection object at 0x11184bfd0>: Failed to establish a new connection: [Errno 61] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/requests/adapters.py", line 417, in send
    timeout=timeout
  File "/usr/local/lib/python3.6/site-packages/requests/packages/urllib3/connectionpool.py", line 640, in urlopen
    _stacktrace=sys.exc_info()[2])
  File "/usr/local/lib/python3.6/site-packages/requests/packages/urllib3/util/retry.py", line 287, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
requests.packages.urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='127.0.0.1', port=4585): Max retries exceeded with url: / (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x11184bfd0>: Failed to establish a new connection: [Errno 61] Connection refused',))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/localstack/mock/generic_proxy.py", line 134, in forward
    headers=forward_headers)
  File "/usr/local/lib/python3.6/site-packages/requests/api.py", line 110, in post
    return request('post', url, data=data, json=json, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/requests/api.py", line 56, in request
    return session.request(method=method, url=url, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/requests/sessions.py", line 471, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/local/lib/python3.6/site-packages/requests/sessions.py", line 581, in send
    r = adapter.send(request, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/requests/adapters.py", line 481, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPConnectionPool(host='127.0.0.1', port=4585): Max retries exceeded with url: / (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x11184bfd0>: Failed to establish a new connection: [Errno 61] Connection refused',))
Running localstack on Python 2.7 works successfully, so I can only assume this something specific with Python 3.6.
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