diff --git a/config/packages/messenger.yaml b/config/packages/messenger.yaml
index 3acf8fb1b9..411a839ae2 100644
--- a/config/packages/messenger.yaml
+++ b/config/packages/messenger.yaml
@@ -13,3 +13,11 @@ framework:
         routing:
             # Route your messages to the transports
             'Chamilo\CoreBundle\Entity\Message': sync_priority_high
+
+# when@test:
+#    framework:
+#        messenger:
+#            transports:
+#                # replace with your transport name here (e.g., my_transport: 'in-memory://')
+#                # For more Messenger testing tools, see https://github.com/zenstruck/messenger-test
+#                async: 'in-memory://'
diff --git a/symfony.lock b/symfony.lock
index 0170d8897f..e94b798b9c 100644
--- a/symfony.lock
+++ b/symfony.lock
@@ -307,12 +307,12 @@
         }
     },
     "symfony/messenger": {
-        "version": "5.4",
+        "version": "6.4",
         "recipe": {
             "repo": "github.com/symfony/recipes",
             "branch": "main",
-            "version": "5.4",
-            "ref": "8bd5f27013fb1d7217191c548e340f0bdb11912c"
+            "version": "6.0",
+            "ref": "ba1ac4e919baba5644d31b57a3284d6ba12d52ee"
         },
         "files": [
             "config/packages/messenger.yaml"