diff --git a/doc/05-Upgrading.md b/doc/05-Upgrading.md
index 4acb7a8ee..acf576b6b 100644
--- a/doc/05-Upgrading.md
+++ b/doc/05-Upgrading.md
@@ -12,6 +12,8 @@ If you are upgrading across multiple versions, make sure to follow the steps for
   Icinga DB Web v1.1](#upgrading-to-icinga-db-web-v11) for details).
   * Modules with support for IDO and Icinga DB will now default to use Icinga DB.
   * The accompanying endpoint `icingadb/migrate/monitoring-url` has been removed.
+* The class `Icinga\Module\Icingadb\Model\Behavior\BoolCast` has been removed.
+  * Use `\ipl\Orm\Behavior\BoolCast` instead.
 
 ## Upgrading to Icinga DB Web v1.2
 
diff --git a/library/Icingadb/Model/Behavior/BoolCast.php b/library/Icingadb/Model/Behavior/BoolCast.php
deleted file mode 100644
index 444cf19fc..000000000
--- a/library/Icingadb/Model/Behavior/BoolCast.php
+++ /dev/null
@@ -1,12 +0,0 @@
-<?php
-
-/* Icinga DB Web | (c) 2020 Icinga GmbH | GPLv2 */
-
-namespace Icinga\Module\Icingadb\Model\Behavior;
-
-/**
- * @deprecated Use {@see \ipl\Orm\Behavior\BoolCast} instead. This will be removed with version 1.3.0
- */
-class BoolCast extends \ipl\Orm\Behavior\BoolCast
-{
-}