SSL Errors

I am trying to update but seeing below error
../gen/openapi/autoupdate.sh
/ --- Downloading and pre-processing OpenAPI spec Traceback (most recent call last): File "//preprocess_spec.py", line 351, in <module> sys.exit(main()) File "//preprocess_spec.py", line 339, in main with pool.request('GET', spec_url, preload_content=False) as response: File "/usr/local/lib/python2.7/dist-packages/urllib3/request.py", line 68, in request **urlopen_kw) File "/usr/local/lib/python2.7/dist-packages/urllib3/request.py", line 89, in request_encode_url return self.urlopen(method, url, **extra_kw) File "/usr/local/lib/python2.7/dist-packages/urllib3/poolmanager.py", line 326, in urlopen response = conn.urlopen(method, u.request_uri, **kw) File "/usr/local/lib/python2.7/dist-packages/urllib3/connectionpool.py", line 670, in urlopen **response_kw) File "/usr/local/lib/python2.7/dist-packages/urllib3/connectionpool.py", line 670, in urlopen **response_kw) File "/usr/local/lib/python2.7/dist-packages/urllib3/connectionpool.py", line 670, in urlopen **response_kw) File "/usr/local/lib/python2.7/dist-packages/urllib3/connectionpool.py", line 641, in urlopen _stacktrace=sys.exc_info()[2]) File "/usr/local/lib/python2.7/dist-packages/urllib3/util/retry.py", line 399, in increment raise MaxRetryError(_pool, url, error or ResponseError(cause)) urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='raw.githubusercontent.com', port=443): Max retries exceeded with url: /appscode/voyager/master/api/openapi-spec/swagger.json (Caused by SSLError(SSLError(1, u'[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661)'),)) You have new mail in /var/mail/murthy