diff --git a/com.woltlab.wcf/package.xml b/com.woltlab.wcf/package.xml
index 67df6b9a952..0285de36449 100644
--- a/com.woltlab.wcf/package.xml
+++ b/com.woltlab.wcf/package.xml
@@ -5,8 +5,8 @@
 		<packagedescription>Free CMS and web-framework, designed for awesome websites and communities.</packagedescription>
 		<packagedescription language="de">Freies CMS und Web-Framework, das eindrucksvolle Websites und Communities ermöglicht.</packagedescription>
 		<isapplication>1</isapplication>
-		<version>5.5.20</version>
-		<date>2024-01-01</date>
+		<version>5.5.21</version>
+		<date>2024-04-22</date>
 	</packageinformation>
 
 	<authorinformation>
@@ -50,7 +50,7 @@
 		<instruction type="script">acp/post_install.php</instruction>
 	</instructions>
 
-	<instructions type="update" fromversion="5.5.19">
+	<instructions type="update" fromversion="5.5.20">
 		<instruction type="file">files_update.tar</instruction>
 	</instructions>
 </package>
diff --git a/wcfsetup/install/files/lib/system/WCF.class.php b/wcfsetup/install/files/lib/system/WCF.class.php
index 61006a3f714..4651066c998 100644
--- a/wcfsetup/install/files/lib/system/WCF.class.php
+++ b/wcfsetup/install/files/lib/system/WCF.class.php
@@ -50,7 +50,7 @@
 }
 
 // define current woltlab suite version
-\define('WCF_VERSION', '5.5.20');
+\define('WCF_VERSION', '5.5.21');
 
 // define current API version
 // @deprecated 5.2