diff --git a/README.md b/README.md
index 71442187..1ed29d23 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 [![Github Actions badge](https://github.com/CanCanCommunity/cancancan/actions/workflows/test.yml/badge.svg)](https://github.com/CanCanCommunity/cancancan/actions/workflows/test.yml/badge.svg)
 [![Code Climate Badge](https://codeclimate.com/github/CanCanCommunity/cancancan.svg)](https://codeclimate.com/github/CanCanCommunity/cancancan)
 
-[Developer guide](http://cancancan.dev) |
+[Developer guide](https://cancancan.dev) |
 [RDocs](https://www.rubydoc.info/github/CanCanCommunity/cancancan) |
 [Screencast 1](http://railscasts.com/episodes/192-authorization-with-cancan) |
 [Screencast 2](https://www.youtube.com/watch?v=cTYu-OjUgDw)