diff --git a/sitemapr/models.py b/sitemapr/models.py
index 36af850..569fd6d 100644
--- a/sitemapr/models.py
+++ b/sitemapr/models.py
@@ -2,7 +2,7 @@
 from decimal import Decimal
 from typing import Literal, TypeVar
 
-from pydantic import BaseModel, ValidationError, validator
+from pydantic import BaseModel, field_validator
 
 T = TypeVar("T")
 
@@ -32,18 +32,17 @@ class SiteMapUrl(BaseModel):
     changefreq: ChangeFreq | None = None  # Google ignores this
     priority: str | None = None  # Google ignores this
 
-    @validator("priority")
+    @field_validator("priority")
+    @classmethod
     def validate_priority(cls, v: str | None) -> str | None:
         if v is None:
             return v
         try:
             priority = Decimal(v)
         except Exception as e:
-            raise ValidationError(
-                "Priority must be a valid decimal string between 0.0 and 1.0"
-            ) from e
+            raise ValueError("Priority must be a valid decimal string between 0.0 and 1.0") from e
 
         if 0 <= priority <= 1:
             return f"{priority:.1f}"
 
-        raise ValidationError("Priority must be between 0.0 and 1.0")
+        raise ValueError("Priority must be between 0.0 and 1.0")