Well it is something out of my control.. because it is in the dependency chain of SmalltalkCI. I will report an issue so it can be fixed. Thanks James.

On Sun, Jun 24, 2018 at 12:48 PM James Foster <Smalltalk@jgfoster.net> wrote:

For several years now we have not had control over the gemstone.com��domain. Please try��http://ss3.gemtalksystems.com/��instead.
James Foster
On Jun 24, 2018, at 10:26 AM, Gabriel Cotelli <g.cotelli@gmail.com> wrote:
http://ss3.gemstone.com/ seems to be unavailble. So some builds are failing due to
Could not resolve: STON-Core [STON-Core-SvenVanCaekenberghe.87] in /home/travis/smalltalkCI-master/_builds/pharo-local/package-cache http://ss3.gemstone.com/ss/STON ERROR: 'GoferRepositoryError: Could not access http://ss3.gemstone.com/ss/STON: ZnHttpUnsuccessful: 500 Internal Server Error'