diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6e324a3..2161318 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,3 +17,7 @@
 - PHP 8.1 compatibility
 ### Removed
 - PHP 8.0 compatibility
+
+## [1.2.1] - 2022-06-29
+### Bugfix
+- Fix return type
\ No newline at end of file
diff --git a/Model/Data/InlineGenerateStatsCollection.php b/Model/Data/InlineGenerateStatsCollection.php
index 18dd364..a721d41 100644
--- a/Model/Data/InlineGenerateStatsCollection.php
+++ b/Model/Data/InlineGenerateStatsCollection.php
@@ -6,6 +6,7 @@
 use ArrayIterator;
 use Countable;
 use IteratorAggregate;
+use Traversable;
 
 class InlineGenerateStatsCollection implements IteratorAggregate, Countable
 {
@@ -30,7 +31,7 @@ public function add(InlineGenerateStats $stats)
     /**
      * @return ArrayIterator|InlineGenerateStats[]
      */
-    public function getIterator()
+    public function getIterator(): Traversable
     {
         return new ArrayIterator($this->statsItems);
     }