--- before/app/models.py
+++ paid/app/models.py
@@ -1,22 +1,20 @@
-from pydantic import BaseModel, validator
+from pydantic import BaseModel, field_validator
 
 
 class Order(BaseModel):
     customer: str
     quantity: int
 
-    @validator("customer")
+    @field_validator("customer")
     def normalize_customer(cls, value):
         value = value.strip()
         if not value:
             raise ValueError("customer required")
         return value
 
-    @validator("quantity")
+    @field_validator("quantity")
     def positive_quantity(cls, value):
         if value < 1:
             raise ValueError("quantity must be positive")
         return value
-
-    class Config:
-        extra = "forbid"
+    model_config = {"extra": "forbid"}
--- before/app/settings.py
+++ paid/app/settings.py
@@ -1,8 +1,6 @@
-from pydantic import BaseSettings
+from pydantic_settings import BaseSettings
 
 
 class Settings(BaseSettings):
     service_name: str = "Order API"
-
-    class Config:
-        env_prefix = "ZIPPER_PROOF_"
+    model_config = {"env_prefix": "ZIPPER_PROOF_"}