diff --git a/src/main/kotlin/com/hero/alignlab/domain/user/model/request/ChangeNicknameRequest.kt b/src/main/kotlin/com/hero/alignlab/domain/user/model/request/ChangeNicknameRequest.kt
index dfde805..6d991a7 100644
--- a/src/main/kotlin/com/hero/alignlab/domain/user/model/request/ChangeNicknameRequest.kt
+++ b/src/main/kotlin/com/hero/alignlab/domain/user/model/request/ChangeNicknameRequest.kt
@@ -3,6 +3,6 @@ package com.hero.alignlab.domain.user.model.request
 import jakarta.validation.constraints.Size
 
 data class ChangeNicknameRequest(
-    @field:Size(max = 200)
+    @field:Size(max = 20)
     val nickname: String,
 )