diff --git a/modules/system/classes/UpdateManager.php b/modules/system/classes/UpdateManager.php
index 12f5b86f2e..8a9569558c 100644
--- a/modules/system/classes/UpdateManager.php
+++ b/modules/system/classes/UpdateManager.php
@@ -1044,8 +1044,7 @@ protected function applyHttpAttributes($http, $postData)
         $postData['server'] = base64_encode(serialize([
             'php'   => PHP_VERSION,
             'url'   => Url::to('/'),
-            // TODO: Store system boot date in `Parameter`
-            'since' => PluginVersion::orderBy('created_at')->first()->created_at
+            'since' => Parameter::get('system::app.birthday'),
         ]));
 
         if ($projectId = Parameter::get('system::project.id')) {