diff --git a/readme.md b/readme.md
index 92b4fcff..8ef1bffc 100644
--- a/readme.md
+++ b/readme.md
@@ -39,7 +39,7 @@ public function bootstrap(): void
 
 ## Documentation
 
-Documentation for this plugin can be found in the [CakePHP Cookbook](https://book.cakephp.org/authentication/2/en/).
+Documentation for this plugin can be found in the [CakePHP Cookbook](https://book.cakephp.org/authentication/3/en/).
 
 ## IDE compatibility improvements