diff --git a/app/schemas/user.py b/app/schemas/user.py
index c5420b6..1c6487a 100644
--- a/app/schemas/user.py
+++ b/app/schemas/user.py
@@ -5,7 +5,7 @@ from pydantic import BaseModel, Field, field_validator
 
 
 class ProfileUpdateRequest(BaseModel):
-    nickname: str = Field(..., min_length=1, max_length=16, description="昵称,1-16 字")
+    nickname: str = Field(..., min_length=1, max_length=20, description="昵称,1-20 字")
 
     @field_validator("nickname")
     @classmethod