diff --git a/composer.json b/composer.json
index e76fed6..214132f 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
     "prefer-stable": true,
     "require": {
         "php": "^7.1.0",
-        "ramsey/uuid" : "^3.6.0",
+        "ramsey/uuid" : "^3.6.0 || ^4.0",
         "beberlei/assert": "^2.7.1 || ^3.0"
     },
     "require-dev": {
diff --git a/src/Messaging/FQCNMessageFactory.php b/src/Messaging/FQCNMessageFactory.php
index e1b3b8c..efba8db 100644
--- a/src/Messaging/FQCNMessageFactory.php
+++ b/src/Messaging/FQCNMessageFactory.php
@@ -38,7 +38,7 @@ public function createMessageFromArray(string $messageName, array $messageData):
         }
 
         if (! isset($messageData['uuid'])) {
-            $messageData['uuid'] = Uuid::uuid4();
+            $messageData['uuid'] = Uuid::uuid4()->toString();
         }
 
         if (! isset($messageData['created_at'])) {