# Pack\_list certificate verify failed **URL:** \ **Category:** Pack\ **Created:** [December 21, 2020, 1:44am UTC](https://swi-prolog.discourse.group/t/pack-list-certificate-verify-failed/3401 "2020-12-21T01:44:33Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![swi](https://avatars.discourse-cdn.com/v4/letter/s/51bf81/32.png) [@swi](https://swi-prolog.discourse.group/u/swi)\ **Post date:** [December 21, 2020, 2:49am UTC](https://swi-prolog.discourse.group/t/pack-list-certificate-verify-failed/3401/2 "2020-12-21T02:49:25Z")
You are using an old version, see: > [@Package install errors - How to resolve after SWI-Prolog changed to using HTTPS](https://swi-prolog.discourse.group/t/package-install-errors-how-to-resolve-after-swi-prolog-changed-to-using-https/895): > > Posting this info here so that it can be indexed by search engines and more easily found. Recently SWI-Prolog switched to using [HTTPS](https://swi-prolog.discourse.group/t/www-swi-prolog-org-goes-https/811) which broke some things for older versions of SWI-Prolog (pre 8.0.3), namely the ability to install packages. Here are examples of the errors: Welcome to SWI-Prolog (threaded, 64 bits, version 8.0.0) SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software. Please run ?- license. for legal details. For online help and background, visit http://www.sw… --- _[View the full topic](https://swi-prolog.discourse.group/t/pack-list-certificate-verify-failed/3401)._