diff --git a/composer.json b/composer.json
index 73cd20f3d1..101515a613 100644
--- a/composer.json
+++ b/composer.json
@@ -33,7 +33,7 @@
         "psr/log": "~1.0",
         "swiftmailer/swiftmailer" : "5.4.8",
         "symfony/console" : "4.2.12",
-        "symfony/event-dispatcher" : "3.4.2",
+        "symfony/event-dispatcher" : "5.4.17",
         "gregwar/captcha": "1.1.9"
     },
     "autoload" : {