diff --git a/homeassistant/package_constraints.txt b/homeassistant/package_constraints.txt
index bbe876cf0da..af2ce318880 100644
--- a/homeassistant/package_constraints.txt
+++ b/homeassistant/package_constraints.txt
@@ -6,7 +6,7 @@ aiodns==3.4.0
 aiohasupervisor==0.3.1
 aiohttp-asyncmdnsresolver==0.1.1
 aiohttp-fast-zlib==0.2.3
-aiohttp==3.12.4
+aiohttp==3.12.6
 aiohttp_cors==0.7.0
 aiousbwatcher==1.1.1
 aiozoneinfo==0.2.3
diff --git a/pyproject.toml b/pyproject.toml
index a3843ef089f..ed6ef2b9bc5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,7 +28,7 @@ dependencies = [
   # change behavior based on presence of supervisor. Deprecated with #127228
   # Lib can be removed with 2025.11
   "aiohasupervisor==0.3.1",
-  "aiohttp==3.12.4",
+  "aiohttp==3.12.6",
   "aiohttp_cors==0.7.0",
   "aiohttp-fast-zlib==0.2.3",
   "aiohttp-asyncmdnsresolver==0.1.1",
diff --git a/requirements.txt b/requirements.txt
index 68813684c56..91edebed063 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@
 # Home Assistant Core
 aiodns==3.4.0
 aiohasupervisor==0.3.1
-aiohttp==3.12.4
+aiohttp==3.12.6
 aiohttp_cors==0.7.0
 aiohttp-fast-zlib==0.2.3
 aiohttp-asyncmdnsresolver==0.1.1
diff --git a/tests/components/hassio/conftest.py b/tests/components/hassio/conftest.py
index ea38865ac5a..a71ee370b32 100644
--- a/tests/components/hassio/conftest.py
+++ b/tests/components/hassio/conftest.py
@@ -63,7 +63,7 @@ async def hassio_client_supervisor(
 
 
 @pytest.fixture
-def hassio_handler(
+async def hassio_handler(
     hass: HomeAssistant, aioclient_mock: AiohttpClientMocker
 ) -> Generator[HassIO]:
     """Create mock hassio handler."""