spark:update GuzzleHttp curl error 60

I realize this has been discussed a lot out there. But for the issues and explanations seem to be relating to Windows. I am on a mac, and using homestead so a bit confused why I am getting this issue as well.

php artisan spark:update
                                                                                
  [GuzzleHttp\Exception\RequestException]                                        
  cURL error 60: SSL certificate problem: unable to get local issuer certificat  
  e (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)