diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9bc339ea..150875e3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -48,5 +48,5 @@ jobs:
       - name: Install package
         run: uv pip install --system .
 
-      - name: Test SDK imports
-        run: python -c "import rootly_sdk; print('SDK imports successfully')"
+      - name: Test SDK
+        run: make test
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c5719583..57675cdc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [2.0.1] - 2026-08-31
+
+### Fixed
+- Allow incident responses with no assigned severity to deserialize successfully ([#18](https://github.com/rootlyhq/rootly-python/issues/18))
+
 ## [2.0.0] - 2026-08-14
 
 ### Added
diff --git a/Makefile b/Makefile
index b35a8635..9cbc5d5a 100644
--- a/Makefile
+++ b/Makefile
@@ -48,4 +48,5 @@ regenerate:
 	@uvx --from ruff==$(RUFF_VERSION) ruff format .
 
 test:
+	python -m unittest discover -s tests
 	python -c "import rootly_sdk; print('SDK imports successfully')"
diff --git a/pyproject.toml b/pyproject.toml
index dfda158f..c8dbe4f9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "rootly"
-version = "2.0.0"
+version = "2.0.1"
 description = "A client library for accessing Rootly API v1"
 authors = []
 readme = "README.md"
diff --git a/rootly_sdk/models/incident.py b/rootly_sdk/models/incident.py
index ee5817ae..aaac3646 100644
--- a/rootly_sdk/models/incident.py
+++ b/rootly_sdk/models/incident.py
@@ -54,7 +54,7 @@ class Incident:
         short_url (Union[None, Unset, str]): The short url to the incident
         public_title (Union[None, Unset, str]): The public title of the incident
         user (Union['IncidentUserType0', None, Unset]): The user who created the incident
-        severity (Union[Unset, SeverityResponse]):
+        severity (Union[None, Unset, SeverityResponse]):
         environments (Union[None, Unset, list['EnvironmentResponse']]): The Environments of the incident
         incident_types (Union[None, Unset, list['IncidentTypeResponse']]): The Incident Types of the incident
         services (Union[None, Unset, list['ServiceResponse']]): The Services of the incident
@@ -195,7 +195,7 @@ class Incident:
     short_url: None | Unset | str = UNSET
     public_title: None | Unset | str = UNSET
     user: Union["IncidentUserType0", None, Unset] = UNSET
-    severity: Union[Unset, "SeverityResponse"] = UNSET
+    severity: Union[None, Unset, "SeverityResponse"] = UNSET
     environments: None | Unset | list["EnvironmentResponse"] = UNSET
     incident_types: None | Unset | list["IncidentTypeResponse"] = UNSET
     services: None | Unset | list["ServiceResponse"] = UNSET
@@ -324,6 +324,7 @@ def to_dict(self) -> dict[str, Any]:
         from ..models.incident_resolved_by_type_0 import IncidentResolvedByType0
         from ..models.incident_started_by_type_0 import IncidentStartedByType0
         from ..models.incident_user_type_0 import IncidentUserType0
+        from ..models.severity_response import SeverityResponse
 
         title = self.title
 
@@ -397,9 +398,13 @@ def to_dict(self) -> dict[str, Any]:
         else:
             user = self.user
 
-        severity: Unset | dict[str, Any] = UNSET
-        if not isinstance(self.severity, Unset):
+        severity: None | Unset | dict[str, Any]
+        if isinstance(self.severity, Unset):
+            severity = UNSET
+        elif isinstance(self.severity, SeverityResponse):
             severity = self.severity.to_dict()
+        else:
+            severity = self.severity
 
         environments: None | Unset | list[dict[str, Any]]
         if isinstance(self.environments, Unset):
@@ -1558,12 +1563,16 @@ def _parse_user(data: object) -> Union["IncidentUserType0", None, Unset]:
 
         user = _parse_user(d.pop("user", UNSET))
 
-        _severity = d.pop("severity", UNSET)
-        severity: Unset | SeverityResponse
-        if isinstance(_severity, Unset):
-            severity = UNSET
-        else:
-            severity = SeverityResponse.from_dict(_severity)
+        def _parse_severity(data: object) -> None | Unset | SeverityResponse:
+            if data is None:
+                return data
+            if isinstance(data, Unset):
+                return data
+            if not isinstance(data, dict):
+                raise TypeError()
+            return SeverityResponse.from_dict(data)
+
+        severity = _parse_severity(d.pop("severity", UNSET))
 
         def _parse_environments(data: object) -> None | Unset | list["EnvironmentResponse"]:
             if data is None:
diff --git a/tests/test_incident_response.py b/tests/test_incident_response.py
new file mode 100644
index 00000000..636c320f
--- /dev/null
+++ b/tests/test_incident_response.py
@@ -0,0 +1,28 @@
+import unittest
+
+from rootly_sdk.models.incident_response import IncidentResponse
+
+
+class TestIncidentResponse(unittest.TestCase):
+    def test_deserializes_and_serializes_null_severity(self) -> None:
+        payload = {
+            "data": {
+                "id": "incident-id",
+                "type": "incidents",
+                "attributes": {
+                    "title": "Scheduled maintenance",
+                    "created_at": "2026-08-31T12:00:00Z",
+                    "updated_at": "2026-08-31T12:00:00Z",
+                    "severity": None,
+                },
+            }
+        }
+
+        response = IncidentResponse.from_dict(payload)
+
+        self.assertIsNone(response.data.attributes.severity)
+        self.assertIsNone(response.to_dict()["data"]["attributes"]["severity"])
+
+
+if __name__ == "__main__":
+    unittest.main()