diff --git a/deno_dist/types.ts b/deno_dist/types.ts
index 1bd7bd32..293199b2 100644
--- a/deno_dist/types.ts
+++ b/deno_dist/types.ts
@@ -20,7 +20,7 @@ export type Env = {
   Variables?: Variables
 }
 
-export type Next = () => Promise<void>
+export type Next = () => void | Promise<void>
 
 export type Input = {
   in?: Partial<ValidationTargets>
@@ -46,7 +46,7 @@ export type MiddlewareHandler<
   E extends Env = any,
   P extends string = string,
   I extends Input = {}
-> = (c: Context<E, P, I>, next: Next) => Promise<Response | void>
+> = (c: Context<E, P, I>, next: Next) => Response | void | Promise<Response | void>
 
 export type H<
   E extends Env = any,