diff --git a/CHANGELOG.md b/CHANGELOG.md
index 833a3a8..b35487d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+# Version 21.0.2
+
+## Bugfixes
+
+* fixing typing error
+
 # Version 21.0.1
 
 ## Bugfixes
diff --git a/src/Observers/EeCleanUpGroupedObserver.php b/src/Observers/EeCleanUpGroupedObserver.php
index f024788..1735b74 100644
--- a/src/Observers/EeCleanUpGroupedObserver.php
+++ b/src/Observers/EeCleanUpGroupedObserver.php
@@ -29,6 +29,6 @@ class EeCleanUpGroupedObserver extends CleanUpGroupedProductRelationObserver
      */
     protected function getLastPrimaryKey(): int
     {
-        return $this->getSubject()->getLastRowId();
+        return (int)$this->getSubject()->getLastRowId();
     }
 }