How can I revitalize my Jessie installation?

[Linux for blind general discussion]

Hello,

My sources.list file is from October 21, 2016. Where can I find a more recent one? I would also like to find a package 
for a recent BRLTTY.

Thanks,
John

-- 
John J. Boyer
Email: john.boyer at abilitiessoft.org
website: http://www.abilitiessoft.org
Status: Company dissolved but website and email addresses  live.
Location: Madison, Wisconsin, USA
Mission: developing assistive technology software and providing STEM services 
        that are available at no cost