diff --git a/UPGRADE.md b/UPGRADE.md
index c0cd9f1d..d0ce323d 100644
--- a/UPGRADE.md
+++ b/UPGRADE.md
@@ -6,6 +6,7 @@
 - **[BUGFIX]** Use Pimcore AdminUserTranslator for Editable Dialog Box [#450](https://github.com/dachcom-digital/pimcore-formbuilder/issues/450)
 - **[BUGFIX]** CSV Export: Ignore mail params with empty data [#461](https://github.com/dachcom-digital/pimcore-formbuilder/issues/461)
 - **[IMPROVEMENT]** Improve json response success message behaviour [#416](https://github.com/dachcom-digital/pimcore-formbuilder/issues/416)
+- **[IMPROVEMENT]** Allow custom message in `DynamicMultiFileNotBlankValidator` constraint [#438](https://github.com/dachcom-digital/pimcore-formbuilder/issues/438)
 - **[IMPROVEMENT]** [#458](https://github.com/dachcom-digital/pimcore-formbuilder/pull/458)
   - Allow to modify FormType options via `FORM_TYPE_OPTIONS` event
   - Do not render `formRuntimeDataToken` if csrf has been disabled in form options 
diff --git a/src/Validator/Constraints/DynamicMultiFileNotBlank.php b/src/Validator/Constraints/DynamicMultiFileNotBlank.php
index 4d49b94e..1ca525db 100644
--- a/src/Validator/Constraints/DynamicMultiFileNotBlank.php
+++ b/src/Validator/Constraints/DynamicMultiFileNotBlank.php
@@ -7,4 +7,11 @@
 class DynamicMultiFileNotBlank extends Constraint
 {
     public string $message = 'This value should not be blank.';
+
+    public function __construct(?array $options = null, ?string $message = null, ?array $groups = null, mixed $payload = null)
+    {
+        parent::__construct($options ?? [], $groups, $payload);
+
+        $this->message = $message ?? $this->message;
+    }
 }