diff --git a/RDAP/RootServer.php b/RDAP/RootServer.php
index e7dd7e9..8bcae39 100644
--- a/RDAP/RootServer.php
+++ b/RDAP/RootServer.php
@@ -88,7 +88,7 @@ private function registrars() : ?string {
     }
 
     protected function help() : string {
-        return json_encode([
+        return strval(json_encode([
             'rdapConformance' => ['rdap_level_0'],
             'notices' => [[
                 'title' => 'About this service',
@@ -102,6 +102,6 @@ protected function help() : string {
                     'rel'   => 'related',
                 ]],
             ]]
-        ]);
+        ]));
     }
 }
diff --git a/RDAP/Server.php b/RDAP/Server.php
index b6b9702..f5b1054 100644
--- a/RDAP/Server.php
+++ b/RDAP/Server.php
@@ -306,7 +306,7 @@ private function isBlocked(IP $ip) : bool {
     }
 
     protected function help() : string {
-        return json_encode([
+        return strval(json_encode([
             'rdapConformance' => ['rdap_level_0'],
             'notices' => [[
                 'title' => 'About this service',
@@ -321,6 +321,6 @@ protected function help() : string {
                     'rel'   => 'related',
                 ]],
             ]]
-        ]);
+        ]));
     }
 }
diff --git a/phpstan.neon b/phpstan.neon
index d45598f..cf90d9d 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -10,5 +10,5 @@ parameters:
   scanDirectories:
     - vendor
   cognitive_complexity:
-      class: 35
+      class: 45
       function: 15