diff --git a/CHANGELOG.md b/CHANGELOG.md
index a61b71d..d134b0b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [4.0.3] - 2026-05-21
+
+### Fixed
+
+* fix: introduce UnknownActivityException instead of InvalidArgumentException in Notifier
+
 ## [4.0.2] - 2026-04-14
 
 ### Fixed
diff --git a/appinfo/info.xml b/appinfo/info.xml
index 3165dcd..63b6666 100644
--- a/appinfo/info.xml
+++ b/appinfo/info.xml
@@ -5,7 +5,7 @@
 	<summary>Integration of Zammad user support/ticketing solution</summary>
 	<description><![CDATA[Zammad integration provides a dashboard widget displaying your important notifications,
 	a search provider for tickets and notifications for new open tickets.]]></description>
-	<version>4.0.2</version>
+	<version>4.0.3</version>
 	<licence>agpl</licence>
 	<author>Julien Veyssier</author>
 	<namespace>Zammad</namespace>
diff --git a/package.json b/package.json
index 611ec58..184db49 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "integration_zammad",
-	"version": "4.0.1",
+	"version": "4.0.3",
 	"description": "Zammad integration",
 	"main": "index.js",
 	"directories": {