diff --git a/README b/README
index b36de002..b47e713f 100644
--- a/README
+++ b/README
@@ -15,4 +15,4 @@ they are mentioned in each file individually. Also thanks to Tim Starling
 for his contributions.
 
 Instructions on installing and using this extension are available at
-<http://www.mediawiki.org/wiki/Extension:CategoryTree>
+<https://www.mediawiki.org/wiki/Extension:CategoryTree>