slack invite URLs

contribute.md

@@ -4,6 +4,6 @@ title: Contribute
 ---
 There are three main ways to contribute to Library Carpentry:
 
-- Join our [mailing list](https://carpentries.topicbox.com/groups/discuss-library-carpentry) or [Slack](https://swc-slack-invite.herokuapp.com/). Here you can suggest new content, volunteer to become a lesson maintainer, or help shape future developments.
+- Join our [mailing list](https://carpentries.topicbox.com/groups/discuss-library-carpentry) or [Slack](https://slack-invite.carpentries.org/). Here you can suggest new content, volunteer to become a lesson maintainer, or help shape future developments.
 - Suggest an improvement or correct an error by [raising an Issue](https://github.com/LibraryCarpentry/lc-shell/issues).
-- Run a workshop at your own institution! If you do, alert us on [TopicBox](https://carpentries.topicbox.com/groups/discuss-library-carpentry) or [Slack](https://swc-slack-invite.herokuapp.com/): we're happy to help promote the workshop and offer guidance on running it. Remember, there is no better way to deepen your own knowledge of software skills than to teach others.
+- Run a workshop at your own institution! If you do, alert us on [TopicBox](https://carpentries.topicbox.com/groups/discuss-library-carpentry) or [Slack](https://slack-invite.carpentries.org/): we're happy to help promote the workshop and offer guidance on running it. Remember, there is no better way to deepen your own knowledge of software skills than to teach others.

learners/discuss.md

@@ -4,7 +4,7 @@ title: Discussion
 
 There are many ways to discuss Library Carpentry lessons:
 
-- Join our [Slack organisation](https://swc-slack-invite.herokuapp.com/) and #libraries channel.
+- Join our [Slack organisation](https://slack-invite.carpentries.org/) and #libraries channel.
 - Stay in touch with our [Topicbox Group](https://carpentries.topicbox.com/groups/discuss-library-carpentry).
 - Follow updates on [Twitter](https://twitter.com/LibCarpentry).
 - Make a suggestion or correct an error by [raising an Issue](https://github.com/LibraryCarpentry/lc-shell/issues) or [submit a pull request](https://github.com/LibraryCarpentry/lc-shell/pulls).