diff --git a/docs/contributing.md b/docs/contributing.md
index 574db7cd6..cf5f68cba 100644
--- a/docs/contributing.md
+++ b/docs/contributing.md
@@ -13,7 +13,7 @@ In brief, if you want to contribute, create or find some [GitHub Issues](https:/
 
 ## Questions and discussions
 
-* [Wikipage](https://wiki.hyperledger.org/projects/cello): Lots of information and documentation about the project, e.g., meeting schedule, design doc.
+* [Wikipage](http://web.archive.org/web/20180917120357/https://wiki.hyperledger.org/projects/cello): Lots of information and documentation about the project, e.g., meeting schedule, design doc.
 * [Mail List](mailto:cello@lists.lfdecentralizedtrust.org): General technical topics with Cello project.
 
 ## Code Commit Steps
diff --git a/docs/index.md b/docs/index.md
index 21cac0ecf..dbd9b66b2 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -32,7 +32,7 @@ Using Cello, blockchain developers can:
 
 ## Contribute to the Project
 * [How to Contribute](contributing.md)
-* [Code Style Guide](https://black.readthedocs.io/en/stable/the_black_code_style.html)
+* [Code Style Guide](http://web.archive.org/web/20210413152114/https://black.readthedocs.io/en/stable/the_black_code_style.html)
 
 ## Design Documentation
 * [Architecture Design](design/arch.md)