diff --git a/plinth/modules/radicale/__init__.py b/plinth/modules/radicale/__init__.py
index 9dd6152e6..37de29ab7 100644
--- a/plinth/modules/radicale/__init__.py
+++ b/plinth/modules/radicale/__init__.py
@@ -32,9 +32,10 @@ _description = [
     format_lazy(
         _('Radicale is a CalDAV and CardDAV server. It allows synchronization '
           'and sharing of scheduling and contact data. To use Radicale, a '
-          '<a href="http://radicale.org/clients/">supported client '
-          'application</a> is needed. Radicale can be accessed by any user '
-          'with a {box_name} login.'), box_name=_(cfg.box_name)),
+          '<a href="https://radicale.org/master.html#documentation/supported-'
+          'clients">supported client application</a> is needed. Radicale can '
+          'be accessed by any user with a {box_name} login.'),
+        box_name=_(cfg.box_name)),
     _('Radicale provides a basic web interface, which only supports creating '
       'new calendars and addressbooks. It does not support adding events or '
       'contacts, which must be done using a separate client.'),