diff --git a/server/src/lib/router.ts b/server/src/lib/router.ts
index 2209179..5f7480b 100644
--- a/server/src/lib/router.ts
+++ b/server/src/lib/router.ts
@@ -8,6 +8,7 @@ type RequestHandler<S extends string> = (
 
 export type Middleware = (
     c: Context<string>,
+    next: () => Promise<Response>,
 ) => Promise<Response | undefined> | Response | undefined;
 
 type MethodHandlers<S extends string> = Partial<