This bug is happening for 3.6 too.  Please see below,

18:14 $ python --version
Python 3.6.3
(upwork) ✔ ~/workspace/personal/assignment [master|✔] 
18:16 $ pip install --upgrade pip
Exception:
Traceback (most recent call last):
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/commands/install.py", line 324, in run
    requirement_set.prepare_files(finder)
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/req/req_set.py", line 380, in prepare_files
    ignore_dependencies=self.ignore_dependencies))
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/req/req_set.py", line 487, in _prepare_file
    req_to_install, finder)
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/req/req_set.py", line 428, in _check_skip_installed
    req_to_install, upgrade_allowed)
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/index.py", line 465, in find_requirement
    all_candidates = self.find_all_candidates(req.name)
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/index.py", line 423, in find_all_candidates
    for page in self._get_pages(url_locations, project_name):
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/index.py", line 568, in _get_pages
    page = self._get_page(location)
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/index.py", line 683, in _get_page
    return HTMLPage.get_page(link, session=self.session)
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/index.py", line 792, in get_page
    "Cache-Control": "max-age=600",
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/_vendor/requests/sessions.py", line 488, in get
    return self.request('GET', url, **kwargs)
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/download.py", line 386, in request
    return super(PipSession, self).request(method, url, *args, **kwargs)
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/_vendor/requests/sessions.py", line 475, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/_vendor/requests/sessions.py", line 596, in send
    r = adapter.send(request, **kwargs)
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/_vendor/requests/adapters.py", line 423, in send
    timeout=timeout
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/_vendor/requests/packages/urllib3/connectionpool.py", line 595, in urlopen
    chunked=chunked)
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/_vendor/requests/packages/urllib3/connectionpool.py", line 363, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/opt/rh/rh-python36/root/usr/lib64/python3.6/http/client.py", line 1239, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/opt/rh/rh-python36/root/usr/lib64/python3.6/http/client.py", line 1285, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/opt/rh/rh-python36/root/usr/lib64/python3.6/http/client.py", line 1234, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/opt/rh/rh-python36/root/usr/lib64/python3.6/http/client.py", line 1026, in _send_output
    self.send(msg)
  File "/opt/rh/rh-python36/root/usr/lib64/python3.6/http/client.py", line 964, in send
    self.connect()
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/_vendor/requests/packages/urllib3/connection.py", line 167, in connect
    conn = self._new_conn()
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/_vendor/requests/packages/urllib3/connection.py", line 142, in _new_conn
    (self.host, self.port), self.timeout, **extra_kw)
  File "/home/dtdev/virtual/upwork/lib/python3.6/site-packages/pip/_vendor/requests/packages/urllib3/util/connection.py", line 85, in create_connection
    sock.settimeout(timeout)
OverflowError: timestamp too large to convert to C _PyTime_t
You are using pip version 9.0.1, however version 18.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.