diff --git a/types/plugin/utc.d.ts b/types/plugin/utc.d.ts
index 544ea4e70..e2350d200 100644
--- a/types/plugin/utc.d.ts
+++ b/types/plugin/utc.d.ts
@@ -1,13 +1,13 @@
-import { PluginFunc, ConfigType } from 'dayjs'
+import { PluginFunc, ConfigType, OptionType } from 'dayjs'
 
 declare const plugin: PluginFunc
 export = plugin
 
 declare module 'dayjs' {
   interface Dayjs {
-    
+
     utc(keepLocalTime?: boolean): Dayjs
-    
+
     local(): Dayjs
 
     isUTC(): boolean
@@ -15,5 +15,5 @@ declare module 'dayjs' {
     utcOffset(offset: number | string, keepLocalTime?: boolean): Dayjs
   }
 
-  export function utc(config?: ConfigType, format?: string, strict?: boolean): Dayjs
+  export function utc(config?: ConfigType, format?: OptionType, strict?: boolean): Dayjs
 }