diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 3aa4afd2..607105b0 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -38,13 +38,13 @@ jobs:
     - name: Test with pytest
       run: |
         poetry run pytest -rfs --cov --cov-config=.coveragerc --cov-report="" --disable-warnings
-        cp .coverage ".coverage.${{ matrix.python-version }}"
+        cp .coverage ".coverage.${{ matrix.python-version }}-${{ matrix.sqlalchemy-version }}-${{ matrix.django-version }}"
     - name: Upload coverage report
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
-        name: coverage-reports
+        name: coverage-reports-${{ matrix.python-version }}-${{ matrix.sqlalchemy-version }}-${{ matrix.django-version }}
         include-hidden-files: true
-        path: ".coverage.${{ matrix.python-version }}"
+        path: ".coverage.${{ matrix.python-version }}-${{ matrix.sqlalchemy-version }}-${{ matrix.django-version }}"
 
   coverage-check:
     name: Coverage check
@@ -60,9 +60,10 @@ jobs:
         run: |
           pip3 install coverage==7.2.3
       - name: Download coverage reports
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
-          name: coverage-reports
+          pattern: coverage-reports-*
+          merge-multiple: true
           path: coverage-reports
       - name: Combine reports
         run: |
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 60ca4c33..90076bba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,9 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [29.0.2] - 2025-02-07
+- Add support of UnionType in OpenAPI schema
+
 ## [29.0.1] - 2024-12-12
 - Make httpx version specification less restrictive
 
diff --git a/pyproject.toml b/pyproject.toml
index 604f9b18..62fa3480 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "winter"
-version = "29.0.1"
+version = "29.0.2"
 homepage = "https://github.com/WinterFramework/winter"
 description = "Web Framework with focus on python typing, dataclasses and modular design"
 authors = ["Alexander Egorov <mofr@zond.org>"]
diff --git a/tests/winter_openapi/test_api_request_and_response_spec.py b/tests/winter_openapi/test_api_request_and_response_spec.py
index 0823ca63..fef08593 100644
--- a/tests/winter_openapi/test_api_request_and_response_spec.py
+++ b/tests/winter_openapi/test_api_request_and_response_spec.py
@@ -1,5 +1,6 @@
 import datetime
 import decimal
+import sys
 import uuid
 from dataclasses import dataclass
 from enum import Enum
@@ -574,6 +575,55 @@ def simple_method(self, data: type_hint):  # pragma: no cover
     assert result['components'] == expected_components
 
 
+@pytest.mark.skipif(
+    not sys.version_info >= (3, 10),
+    reason="These tests require Python 3.10 or higher"
+)
+def test_request_type_with_union_undefined():
+    @dataclass
+    class RequestBodyWithUnionUndefined:
+        """Some description"""
+        field_a: str | Undefined
+        field_b: str | Undefined = Undefined()
+
+    class _TestAPI:
+        @winter.route_post('/types/')
+        @winter.request_body('data')
+        def simple_method(self, data: RequestBodyWithUnionUndefined):  # pragma: no cover
+            pass
+
+    expected_request_body_spec = {
+            'schema': {
+                '$ref': '#/components/schemas/RequestBodyWithUnionUndefinedInput',
+            },
+        }
+    expected_components = {
+            'parameters': {},
+            'responses': {},
+            'schemas': {
+                'RequestBodyWithUnionUndefinedInput': {
+                    'title': 'RequestBodyWithUnionUndefinedInput',
+                    'description': 'Some description',
+                    'type': 'object',
+                    'properties': {
+                        'field_a': {'type': 'string'},
+                        'field_b': {'type': 'string'},
+                    },
+                },
+            },
+        }
+
+    route = get_route(_TestAPI.simple_method)
+
+    # Act
+    result = generate_openapi(title='title', version='1.0.0', routes=[route])
+
+    # Assert
+    method_info = result['paths']['/types/']['post']['requestBody']
+    assert method_info == {'content': {'application/json': expected_request_body_spec}, 'required': False}
+    assert result['components'] == expected_components
+
+
 @dataclass
 class DataclassWithUndefined:
     """DataclassWithUndefined description"""
diff --git a/winter/core/utils/typing.py b/winter/core/utils/typing.py
index 0c31ea96..2ed09ede 100644
--- a/winter/core/utils/typing.py
+++ b/winter/core/utils/typing.py
@@ -1,8 +1,9 @@
 import inspect
-import sys
+import types
 from typing import Iterable
 from typing import TypeVar
 from typing import Union
+from typing import get_args
 
 NoneType = type(None)
 UnionType = type(Union)
@@ -37,6 +38,12 @@ def get_union_args(type_: object) -> list:
 
 
 def get_origin_type(hint_class):
+    if hasattr(types, 'UnionType') and isinstance(hint_class, types.UnionType):
+        # Extract the arguments of the union (e.g., `str | int` -> (str, int))
+        args = get_args(hint_class)
+        # Convert to the old `typing.Union` style
+        hint_class = Union[args]
+
     return getattr(hint_class, '__origin__', None) or hint_class