diff --git a/.oss-upstream b/.oss-upstream
new file mode 100644
index 000000000..d7569c687
--- /dev/null
+++ b/.oss-upstream
@@ -0,0 +1 @@
+practical-tutorials/project-based-learning
diff --git a/README.md b/README.md
index b5906c7ef..71e2d1c18 100644
--- a/README.md
+++ b/README.md
@@ -233,7 +233,7 @@ To get started, simply fork this repo. Please refer to [CONTRIBUTING.md](CONTRIB
 
 - [Create Serverless React.js Apps](http://serverless-stack.com/)
 - [Create a Trello Clone](http://codeloveandboards.com/blog/2016/01/04/trello-tribute-with-phoenix-and-react-pt-1/)
-- [Create a Character Voting App with React, Node, MongoDB and SocketIO](http://sahatyalkabov.com/create-a-character-voting-app-using-react-nodejs-mongodb-and-socketio)
+- [Create a Character Voting App with React, Node, MongoDB and SocketIO](http://web.archive.org/web/20230205102548/http://sahatyalkabov.com/create-a-character-voting-app-using-react-nodejs-mongodb-and-socketio/)
 - [React Tutorial: Cloning Yelp](https://www.fullstackreact.com/articles/react-tutorial-cloning-yelp/)
 - [Build a Full Stack Movie Voting App with Test-First Development using Mocha, React, Redux and Immutable](https://teropa.info/blog/2015/09/10/full-stack-redux-tutorial.html)
 - [Build A Simple Medium Clone using React.js and Node.js](https://medium.com/@kris101/clone-medium-on-node-js-and-react-js-731cdfbb6878)
@@ -612,7 +612,7 @@ To get started, simply fork this repo. Please refer to [CONTRIBUTING.md](CONTRIB
 
 ## Haskell:
 
-- [Write You a Haskell - Build a modern functional compiler](http://dev.stephendiehl.com/fun/)
+- [Write You a Haskell - Build a modern functional compiler](https://github.com/sdiehl/write-you-a-haskell)
 - [Write Yourself a Scheme in 48 hours](https://en.wikibooks.org/wiki/Write_Yourself_a_Scheme_in_48_Hours)
 - [Write You A Scheme, Version 2](https://github.com/adamwespiser/scheme)
 - [Roll Your Own IRC Bot](https://wiki.haskell.org/Roll_your_own_IRC_bot)
@@ -670,7 +670,7 @@ To get started, simply fork this repo. Please refer to [CONTRIBUTING.md](CONTRIB
 - [Exercism](http://www.exercism.io/)
 - [Egghead.io](http://www.egghead.io/)
 - [Michael Herman's Blog](http://mherman.org/)
-- [Thinkster.io](http://thinkster.io)
+- [Thinkster.io](http://web.archive.org/web/20250922175418/https://thinkster.io/)
 - [Enlight](https://enlight.nyc/)
 - [Hack Club Workshops](https://hackclub.com/workshops/)
 - [CodeCrafters](https://codecrafters.io/)