diff --git a/README.md b/README.md
index c087fa6..08b0a4f 100644
--- a/README.md
+++ b/README.md
@@ -108,7 +108,7 @@ Prior to installing `php-orm-database` get the [Composer](https://getcomposer.or
 **Step 1** — update your `composer.json`:
 ```composer.json
 "require": {
-    "peterson/php-orm-database": "^3.1.8"
+    "peterson/php-orm-database": "^3.1.9"
 }
 ```
 
diff --git a/composer.json b/composer.json
index 35765cb..5193597 100644
--- a/composer.json
+++ b/composer.json
@@ -38,7 +38,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-main": "3.1.8-dev"
+            "dev-main": "3.1.9-dev"
         }
     },
     "minimum-stability": "stable",
diff --git a/src/Collections/Collection.php b/src/Collections/Collection.php
index 8208c2c..ee96d53 100644
--- a/src/Collections/Collection.php
+++ b/src/Collections/Collection.php
@@ -57,9 +57,9 @@ public function __construct($items = [])
     public function getIterator() : Traversable
     {
         // Automatically wrap Mappers into an array
-        $this->items = $this->wrapArrayIntoCollectionMappers($this->items);
+        $items = $this->wrapArrayIntoCollectionMappers($this->items);
 
-        return new ArrayIterator($this->items);
+        return new ArrayIterator($items);
     }
 
     /**