diff --git a/CHANGELOG.md b/CHANGELOG.md
index 318e340e7..25c5ad2d1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,10 @@ All notable changes to this project will be documented in this file.
 * Rename queue option `table` to `collection`
 * Replace queue option `expire` with `retry_after`
 
+## [4.3.1]
+
+* Fix memory leak when filling nested fields using dot notation by @GromNaN in [#2962](https://github.com/mongodb/laravel-mongodb/pull/2962)
+
 ## [4.3.0] - 2024-04-26
 
 * New aggregation pipeline builder by @GromNaN in [#2738](https://github.com/mongodb/laravel-mongodb/pull/2738)
diff --git a/src/Eloquent/Model.php b/src/Eloquent/Model.php
index de5ddc3ea..5974e49e1 100644
--- a/src/Eloquent/Model.php
+++ b/src/Eloquent/Model.php
@@ -46,7 +46,6 @@
 use function str_contains;
 use function str_starts_with;
 use function strcmp;
-use function uniqid;
 use function var_export;
 
 /** @mixin Builder */
@@ -55,6 +54,8 @@ abstract class Model extends BaseModel
     use HybridRelations;
     use EmbedsRelations;
 
+    private const TEMPORARY_KEY = '__LARAVEL_TEMPORARY_KEY__';
+
     /**
      * The collection associated with the model.
      *
@@ -271,12 +272,10 @@ public function setAttribute($key, $value)
         // Support keys in dot notation.
         if (str_contains($key, '.')) {
             // Store to a temporary key, then move data to the actual key
-            $uniqueKey = uniqid($key);
-
-            parent::setAttribute($uniqueKey, $value);
+            parent::setAttribute(self::TEMPORARY_KEY, $value);
 
-            Arr::set($this->attributes, $key, $this->attributes[$uniqueKey] ?? null);
-            unset($this->attributes[$uniqueKey]);
+            Arr::set($this->attributes, $key, $this->attributes[self::TEMPORARY_KEY] ?? null);
+            unset($this->attributes[self::TEMPORARY_KEY]);
 
             return $this;
         }