diff --git a/phrasetms_client/models/uid_reference.py b/phrasetms_client/models/uid_reference.py
index 8975b0d..14d867f 100644
--- a/phrasetms_client/models/uid_reference.py
+++ b/phrasetms_client/models/uid_reference.py
@@ -1,14 +1,14 @@
 # coding: utf-8
 
 """
-    Phrase TMS API
+Phrase TMS API
 
-    Welcome to Phrase's TMS API documentation.    Please visit our [help center](https://support.phrase.com/hc/en-us/sections/5709662083612) for more information about the APIs.    If you have any questions, please contact [Support](https://support.phrase.com/hc/requests/new).    Please, include the `User-Agent` header with the name of your application or project. It might be a good idea to include some sort of contact information as well, so that we can get in touch if necessary. Examples of excellent `User-Agent` headers:  > User-Agent: Example mobile app (example@phrase.com) <br/> User-Agent: ACME Inc Java 1.8 Client (http://acmeinc.com/contact)  # noqa: E501
+Welcome to Phrase's TMS API documentation.    Please visit our [help center](https://support.phrase.com/hc/en-us/sections/5709662083612) for more information about the APIs.    If you have any questions, please contact [Support](https://support.phrase.com/hc/requests/new).    Please, include the `User-Agent` header with the name of your application or project. It might be a good idea to include some sort of contact information as well, so that we can get in touch if necessary. Examples of excellent `User-Agent` headers:  > User-Agent: Example mobile app (example@phrase.com) <br/> User-Agent: ACME Inc Java 1.8 Client (http://acmeinc.com/contact)  # noqa: E501
 
-    The version of the OpenAPI document: Latest
-    Generated by OpenAPI Generator (https://openapi-generator.tech)
+The version of the OpenAPI document: Latest
+Generated by OpenAPI Generator (https://openapi-generator.tech)
 
-    Do not edit the class manually.
+Do not edit the class manually.
 """
 
 
@@ -18,18 +18,21 @@
 import json
 
 
+from typing import Optional
+from pydantic import BaseModel, StrictStr
 
-from pydantic import BaseModel, Field, StrictStr
 
 class UidReference(BaseModel):
     """
     UidReference
     """
-    uid: StrictStr = Field(...)
+
+    uid: Optional[StrictStr] = None
     __properties = ["uid"]
 
     class Config:
         """Pydantic configuration"""
+
         allow_population_by_field_name = True
         validate_assignment = True
 
@@ -48,10 +51,7 @@ def from_json(cls, json_str: str) -> UidReference:
 
     def to_dict(self):
         """Returns the dictionary representation of the model using alias"""
-        _dict = self.dict(by_alias=True,
-                          exclude={
-                          },
-                          exclude_none=True)
+        _dict = self.dict(by_alias=True, exclude={}, exclude_none=True)
         return _dict
 
     @classmethod
@@ -63,8 +63,7 @@ def from_dict(cls, obj: dict) -> UidReference:
         if not isinstance(obj, dict):
             return UidReference.parse_obj(obj)
 
-        _obj = UidReference.parse_obj({
-            "uid": obj.get("uid")
-        })
+        _obj = UidReference.parse_obj(
+            {"uid": obj.get("uid") if obj.get("uid") is not None else None}
+        )
         return _obj
-