diff --git a/system/composer.json b/system/composer.json
index e96b11776..a31b6d37b 100644
--- a/system/composer.json
+++ b/system/composer.json
@@ -8,6 +8,6 @@
     "pear/http_request2": "~2.3.0",
     "splitbrain/php-archive": "~1.0",
     "htmlawed/htmlawed": "~1.0",
-    "swiftmailer/swiftmailer": "~5.4"
+    "swiftmailer/swiftmailer": "5.4.4"
   }
 }