diff --git a/app/requirements.txt b/app/requirements.txt
index 4773bc4..05dfe65 100644
--- a/app/requirements.txt
+++ b/app/requirements.txt
@@ -1,6 +1,7 @@
 fastapi
 playwright
 pydantic
+pydantic-settings
 uvicorn[standard]
 Wand
 yggdrasil-mc==0.1b6
\ No newline at end of file
diff --git a/app/settings.py b/app/settings.py
index dfa71d3..3490e2e 100644
--- a/app/settings.py
+++ b/app/settings.py
@@ -1,4 +1,4 @@
-from pydantic import BaseSettings
+from pydantic_settings import BaseSettings
 
 
 class Settings(BaseSettings):
diff --git a/app/skinview3d/models.py b/app/skinview3d/models.py
index ff322b8..5362ca9 100644
--- a/app/skinview3d/models.py
+++ b/app/skinview3d/models.py
@@ -1,5 +1,6 @@
-from pydantic import BaseModel, root_validator, confloat
+from pydantic import model_validator, Field, BaseModel
 import base64
+from typing_extensions import Annotated
 
 
 class BackendInfo(BaseModel):
@@ -8,8 +9,8 @@ class BackendInfo(BaseModel):
 
 
 class CommonResponse(BaseModel):
-    front: bytes | None
-    back: bytes | None
+    front: bytes | None = None
+    back: bytes | None = None
     both: bytes | None = None
     backendInfo: BackendInfo
 
@@ -29,14 +30,15 @@ class All_Response_Json(BaseModel):
     both_b64: str
     backendInfo: BackendInfo
     
-    @root_validator(pre=True)
+    @model_validator(mode="before")
+    @classmethod
     def convertToBase64(cls, values):
         for i in ("front", "back", "both"):
             values[f"{i}_b64"] = base64.b64encode(values[i]) if values[i] else ''
         return values
 
 class CommonOptions(BaseModel):
-    definition: confloat(ge=0.8, le=3.5) = 1.5
+    definition: Annotated[float, Field(ge=0.8, le=3.5)] = 1.5
     transparent: bool = False    
 
 class CommonQuery(CommonOptions):