diff --git a/libs/bunny-sdk/types/bunny.d.ts b/libs/bunny-sdk/types/bunny.d.ts
index 18314fa..3dc4915 100644
--- a/libs/bunny-sdk/types/bunny.d.ts
+++ b/libs/bunny-sdk/types/bunny.d.ts
@@ -14,7 +14,7 @@ declare namespace Bunny {
     registerMiddlewares: (middlewares: {
       onOriginRequest: Array<(
         ctx: { request: Request },
-      ) => Promise<Request> | Promise<Response> | undefined>
+      ) => Promise<Request> | Promise<Response> | Promise<Request | Response> | undefined>
       onOriginResponse: Array<(
         ctx: { request: Request, response: Response },
       ) => Promise<Request> | Promise<Response> | undefined>