diff --git a/src/ipam/docs/FixedAddress.md b/src/ipam/docs/FixedAddress.md
index 432c3c3..d677d82 100644
--- a/src/ipam/docs/FixedAddress.md
+++ b/src/ipam/docs/FixedAddress.md
@@ -6,7 +6,7 @@ A __FixedAddress__ object (_dhcp/fixed_address_) reserves an address for a speci
 
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**address** | **str** | The reserved address. | 
+**address** | **str** | The reserved address. | [optional] 
 **comment** | **str** | The description for the fixed address. May contain 0 to 1024 characters. Can include UTF-8. | [optional] 
 **compartment_id** | **str** | The compartment associated with the object. If no compartment is associated with the object, the value defaults to empty. | [optional] [readonly] 
 **created_at** | **datetime** | Time when the object has been created. | [optional] [readonly] 
diff --git a/src/ipam/models/fixed_address.py b/src/ipam/models/fixed_address.py
index 94a1e1c..17d1990 100644
--- a/src/ipam/models/fixed_address.py
+++ b/src/ipam/models/fixed_address.py
@@ -30,7 +30,8 @@ class FixedAddress(BaseModel):
     """
     A __FixedAddress__ object (_dhcp/fixed_address_) reserves an address for a specific client. It must have a _match_type_ and a valid corresponding _match_value_ so it can match that client.
     """ # noqa: E501
-    address: StrictStr = Field(description="The reserved address.")
+    address: Optional[StrictStr] = Field(default=None,
+                                         description="The reserved address.")
     comment: Optional[StrictStr] = Field(
         default=None,
         description=