diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 90eeef65..7c37fb19 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "4.8.0"
+  ".": "4.8.1"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 02cf9d94..6643d58e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 4.8.1 (2025-07-22)
+
+Full Changelog: [v4.8.0...v4.8.1](https://github.com/orbcorp/orb-python/compare/v4.8.0...v4.8.1)
+
+### Bug Fixes
+
+* **parsing:** parse extra field types ([4b3a543](https://github.com/orbcorp/orb-python/commit/4b3a54366880f6ff2955db1d3d9986af47d1e25a))
+
 ## 4.8.0 (2025-07-21)
 
 Full Changelog: [v4.7.0...v4.8.0](https://github.com/orbcorp/orb-python/compare/v4.7.0...v4.8.0)
diff --git a/pyproject.toml b/pyproject.toml
index 4a95d259..5c32f4a2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "orb-billing"
-version = "4.8.0"
+version = "4.8.1"
 description = "The official Python library for the orb API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/orb/_models.py b/src/orb/_models.py
index ffcbf67b..b8387ce9 100644
--- a/src/orb/_models.py
+++ b/src/orb/_models.py
@@ -208,14 +208,18 @@ def construct(  # pyright: ignore[reportIncompatibleMethodOverride]
             else:
                 fields_values[name] = field_get_default(field)
 
+        extra_field_type = _get_extra_fields_type(__cls)
+
         _extra = {}
         for key, value in values.items():
             if key not in model_fields:
+                parsed = construct_type(value=value, type_=extra_field_type) if extra_field_type is not None else value
+
                 if PYDANTIC_V2:
-                    _extra[key] = value
+                    _extra[key] = parsed
                 else:
                     _fields_set.add(key)
-                    fields_values[key] = value
+                    fields_values[key] = parsed
 
         object.__setattr__(m, "__dict__", fields_values)
 
@@ -370,6 +374,23 @@ def _construct_field(value: object, field: FieldInfo, key: str) -> object:
     return construct_type(value=value, type_=type_, metadata=getattr(field, "metadata", None))
 
 
+def _get_extra_fields_type(cls: type[pydantic.BaseModel]) -> type | None:
+    if not PYDANTIC_V2:
+        # TODO
+        return None
+
+    schema = cls.__pydantic_core_schema__
+    if schema["type"] == "model":
+        fields = schema["schema"]
+        if fields["type"] == "model-fields":
+            extras = fields.get("extras_schema")
+            if extras and "cls" in extras:
+                # mypy can't narrow the type
+                return extras["cls"]  # type: ignore[no-any-return]
+
+    return None
+
+
 def is_basemodel(type_: type) -> bool:
     """Returns whether or not the given type is either a `BaseModel` or a union of `BaseModel`"""
     if is_union(type_):
diff --git a/src/orb/_version.py b/src/orb/_version.py
index 94848477..a6ab00ac 100644
--- a/src/orb/_version.py
+++ b/src/orb/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "orb"
-__version__ = "4.8.0"  # x-release-please-version
+__version__ = "4.8.1"  # x-release-please-version
diff --git a/tests/test_models.py b/tests/test_models.py
index 6a744074..dbf441e1 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -1,5 +1,5 @@
 import json
-from typing import Any, Dict, List, Union, Optional, cast
+from typing import TYPE_CHECKING, Any, Dict, List, Union, Optional, cast
 from datetime import datetime, timezone
 from typing_extensions import Literal, Annotated, TypeAliasType
 
@@ -934,3 +934,30 @@ class Type2(BaseModel):
     )
     assert isinstance(model, Type1)
     assert isinstance(model.value, InnerType2)
+
+
+@pytest.mark.skipif(not PYDANTIC_V2, reason="this is only supported in pydantic v2 for now")
+def test_extra_properties() -> None:
+    class Item(BaseModel):
+        prop: int
+
+    class Model(BaseModel):
+        __pydantic_extra__: Dict[str, Item] = Field(init=False)  # pyright: ignore[reportIncompatibleVariableOverride]
+
+        other: str
+
+        if TYPE_CHECKING:
+
+            def __getattr__(self, attr: str) -> Item: ...
+
+    model = construct_type(
+        type_=Model,
+        value={
+            "a": {"prop": 1},
+            "other": "foo",
+        },
+    )
+    assert isinstance(model, Model)
+    assert model.a.prop == 1
+    assert isinstance(model.a, Item)
+    assert model.other == "foo"