1 files changed, 5 insertions, 3 deletions
diff --git a/matrix-specification/Responses/ClientAccountWhoamiGetResponse.php b/matrix-specification/Responses/ClientAccountWhoamiGetResponse.php
index 48fbbde..2f7ff81 100644
--- a/matrix-specification/Responses/ClientAccountWhoamiGetResponse.php
+++ b/matrix-specification/Responses/ClientAccountWhoamiGetResponse.php
@@ -2,7 +2,9 @@
 
 namespace Matrix\Responses;
 
-class ClientAccountWhoamiGetResponse implements \JsonSerializable
+use Matrix\Response;
+
+class ClientAccountWhoamiGetResponse extends Response
 {
   public function __construct(
     private string $userId,
@@ -11,12 +13,12 @@ class ClientAccountWhoamiGetResponse implements \JsonSerializable
   )
   {}
 
-  public function jsonSerialize(): array
+  public function getBody(): array
   {
     return array_filter([
       "device_id" => $this->deviceId,
       "is_guest" => $this->isGuest,
       "user_id" => $this->userId,
-    ], "is_null");
+    ], fn ($value) => ! is_null($value));
   }
 }