diff --git a/CHANGELOG.md b/CHANGELOG.md
index 581ce15da..e50f84c61 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+### 10.0.3 <small>(2023-11-27)</small>
+
+#### Bugfixes
+
+* The validation factory `$container` constructor parameter no longer accepts null.
+
+--------------------------------------------------------
+
 ### 10.0.2 <small>(2023-11-25)</small>
 
 #### New
diff --git a/src/mako/validator/ValidatorFactory.php b/src/mako/validator/ValidatorFactory.php
index 5f85756af..0b804bad5 100644
--- a/src/mako/validator/ValidatorFactory.php
+++ b/src/mako/validator/ValidatorFactory.php
@@ -25,7 +25,7 @@ class ValidatorFactory
 	 */
 	public function __construct(
 		protected ?I18n $i18n = null,
-		protected ?Container $container = null
+		protected Container $container = new Container,
 	) {
 	}