diff --git a/pyproject.toml b/pyproject.toml
index b9cf622..06169a8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "violet-poolController-api"
-version = "0.0.25"
+version = "0.0.26"
 authors = [
   { name="Basti (Xerolux)", email="git@xerolux.de" },
 ]
@@ -24,12 +24,12 @@ classifiers = [
     "Topic :: Home Automation",
 ]
 dependencies = [
-    "aiohttp>=3.11.0",
+    "aiohttp>=3.11.0,<3.14",
 ]
 
 [project.optional-dependencies]
 test = [
-    "aioresponses>=0.7.7",
+    "aioresponses>=0.7.8",
     "pytest>=8.3",
     "pytest-asyncio>=0.24",
 ]
@@ -45,13 +45,13 @@ asyncio_mode = "auto"
 
 [tool.ruff]
 line-length = 100
-target-version = "0.0.25"
+target-version = "py312"
 
 [tool.ruff.lint]
 select = ["E", "F", "W", "I", "UP"]
 ignore = ["E501"]
 
 [tool.mypy]
-python_version = "0.0.25"
+python_version = "3.12"
 warn_return_any = true
 warn_unused_configs = true
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..4dd6f6a
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,40 @@
+# violet-poolController-api - API für Violet Pool Controller
+# Copyright (C) 2024-2026  Xerolux
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published
+# by the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+"""Pytest configuration and fixtures."""
+
+from __future__ import annotations
+
+from inspect import signature
+
+import aiohttp.client_reqrep
+
+_original_client_response_init = aiohttp.client_reqrep.ClientResponse.__init__
+
+
+def _patched_client_response_init(
+    self: aiohttp.client_reqrep.ClientResponse,
+    *args: object,
+    **kwargs: object,
+) -> None:
+    """Patched ClientResponse.__init__ that adds stream_writer if missing."""
+    sig = signature(_original_client_response_init)
+    if "stream_writer" in sig.parameters and "stream_writer" not in kwargs:
+        kwargs["stream_writer"] = None
+    _original_client_response_init(self, *args, **kwargs)
+
+
+aiohttp.client_reqrep.ClientResponse.__init__ = _patched_client_response_init