diff --git a/arranges/src/arranges/ranges.py b/arranges/src/arranges/ranges.py
index 3fcfc82..2b227c3 100644
--- a/arranges/src/arranges/ranges.py
+++ b/arranges/src/arranges/ranges.py
@@ -2,6 +2,9 @@
 from functools import lru_cache
 from typing import Any, Iterable
 
+from pydantic import GetCoreSchemaHandler
+from pydantic_core import CoreSchema, core_schema
+
 from arranges.segment import Segment, range_idx
 from arranges.utils import inf, is_intlike, is_iterable, is_rangelike, try_hash
 
@@ -269,11 +272,13 @@ def validate(cls, value: Any) -> "Ranges":
         return cls(value)
 
     @classmethod
-    def __get_validators__(cls):
+    def __get_pydantic_core_schema__(
+        cls, source_type: Any, handler: GetCoreSchemaHandler
+    ) -> CoreSchema:
         """
         For automatic validation in pydantic
         """
-        yield cls.validate
+        return core_schema.no_info_after_validator_function(cls, handler(Any))
 
     @property
     def first(self):
diff --git a/arranges/tests/range/serialize/test_serialize.py b/arranges/tests/range/serialize/test_serialize.py
index c09635f..54219ff 100644
--- a/arranges/tests/range/serialize/test_serialize.py
+++ b/arranges/tests/range/serialize/test_serialize.py
@@ -10,10 +10,10 @@ class Model(BaseModel):
 def test_serialize():
     model = Model(input_range="0:10,20:30,15:")
 
-    assert model.json() == '{"input_range": ":10,15:"}'
+    assert model.model_dump_json() == '{"input_range":":10,15:"}'
 
 
 def test_deserialize():
-    model = Model.parse_raw('{"input_range": "0:10,20:30,15:"}')
+    model = Model.model_validate_json('{"input_range":"0:10,20:30,15:"}')
 
     assert model.input_range == ":10,15:"
diff --git a/arranges/tests/range/serialize/test_validator.py b/arranges/tests/range/serialize/test_validator.py
index c47008f..b735726 100644
--- a/arranges/tests/range/serialize/test_validator.py
+++ b/arranges/tests/range/serialize/test_validator.py
@@ -1,14 +1,12 @@
 import pytest
-from pydantic import BaseModel, ValidationError
+from pydantic import BaseModel, ConfigDict, ValidationError
 
 from arranges import Ranges
 
 
 class ModelWithRange(BaseModel):
     range: Ranges
-
-    class Config:
-        arbitrary_types_allowed = True
+    model_config = ConfigDict(arbitrary_types_allowed=True)
 
 
 def test_working_range_str():