diff --git a/py_clob_client/clob_types.py b/py_clob_client/clob_types.py
index 8811a72..ce0877f 100644
--- a/py_clob_client/clob_types.py
+++ b/py_clob_client/clob_types.py
@@ -1,3 +1,4 @@
+from enum import Enum
 from typing import Any
 from dataclasses import dataclass, asdict
 from json import dumps
@@ -9,7 +10,7 @@
 from .constants import ZERO_ADDRESS
 
 
-class OrderType(enumerate):
+class OrderType(str, Enum):
     GTC = "GTC"
     FOK = "FOK"
     GTD = "GTD"
@@ -184,7 +185,7 @@ def json(self):
         return dumps(self.__dict__, separators=(",", ":"))
 
 
-class AssetType(enumerate):
+class AssetType(str, Enum):
     COLLATERAL = "COLLATERAL"
     CONDITIONAL = "CONDITIONAL"