diff --git a/homeassistant/components/cisco_webex_teams/notify.py b/homeassistant/components/cisco_webex_teams/notify.py
index 60cb4a581c2796..30f56ac4712063 100644
--- a/homeassistant/components/cisco_webex_teams/notify.py
+++ b/homeassistant/components/cisco_webex_teams/notify.py
@@ -3,9 +3,9 @@
 from __future__ import annotations
 
 import logging
-import sys
 
 import voluptuous as vol
+from webexteamssdk import ApiError, WebexTeamsAPI, exceptions
 
 from homeassistant.components.notify import (
     ATTR_TITLE,
@@ -14,14 +14,9 @@
 )
 from homeassistant.const import CONF_TOKEN
 from homeassistant.core import HomeAssistant
-from homeassistant.exceptions import HomeAssistantError
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
-if sys.version_info < (3, 12):
-    from webexteamssdk import ApiError, WebexTeamsAPI, exceptions
-
-
 _LOGGER = logging.getLogger(__name__)
 
 CONF_ROOM_ID = "room_id"
@@ -37,11 +32,6 @@ def get_service(
     discovery_info: DiscoveryInfoType | None = None,
 ) -> CiscoWebexTeamsNotificationService | None:
     """Get the CiscoWebexTeams notification service."""
-    if sys.version_info >= (3, 12):
-        raise HomeAssistantError(
-            "Cisco Webex Teams is not supported on Python 3.12. Please use Python 3.11."
-        )
-
     client = WebexTeamsAPI(access_token=config[CONF_TOKEN])
     try:
         # Validate the token & room_id
diff --git a/homeassistant/components/sensor/__init__.py b/homeassistant/components/sensor/__init__.py
index ce32be40b30741..92499a05af48e4 100644
--- a/homeassistant/components/sensor/__init__.py
+++ b/homeassistant/components/sensor/__init__.py
@@ -11,9 +11,7 @@
 from functools import partial
 import logging
 from math import ceil, floor, isfinite, log10
-from typing import TYPE_CHECKING, Any, Final, Self, cast, final
-
-from typing_extensions import override
+from typing import TYPE_CHECKING, Any, Final, Self, cast, final, override
 
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import (  # noqa: F401
diff --git a/homeassistant/const.py b/homeassistant/const.py
index 5c2908dc515d3f..6e657469b9a364 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -20,10 +20,10 @@
 PATCH_VERSION: Final = "0.dev0"
 __short_version__: Final = f"{MAJOR_VERSION}.{MINOR_VERSION}"
 __version__: Final = f"{__short_version__}.{PATCH_VERSION}"
-REQUIRED_PYTHON_VER: Final[tuple[int, int, int]] = (3, 11, 0)
+REQUIRED_PYTHON_VER: Final[tuple[int, int, int]] = (3, 12, 0)
 REQUIRED_NEXT_PYTHON_VER: Final[tuple[int, int, int]] = (3, 12, 0)
 # Truthy date string triggers showing related deprecation warning messages.
-REQUIRED_NEXT_PYTHON_HA_RELEASE: Final = "2024.4"
+REQUIRED_NEXT_PYTHON_HA_RELEASE: Final = ""
 
 # Format for platform files
 PLATFORM_FORMAT: Final = "{platform}.{domain}"
diff --git a/homeassistant/util/async_.py b/homeassistant/util/async_.py
index acf5d8e663966b..8c042242e0beb1 100644
--- a/homeassistant/util/async_.py
+++ b/homeassistant/util/async_.py
@@ -8,7 +8,6 @@
 from contextlib import suppress
 import functools
 import logging
-import sys
 import threading
 from typing import Any, ParamSpec, TypeVar, TypeVarTuple
 
@@ -23,35 +22,20 @@
 _P = ParamSpec("_P")
 _Ts = TypeVarTuple("_Ts")
 
-if sys.version_info >= (3, 12, 0):
-
-    def create_eager_task(
-        coro: Coroutine[Any, Any, _T],
-        *,
-        name: str | None = None,
-        loop: AbstractEventLoop | None = None,
-    ) -> Task[_T]:
-        """Create a task from a coroutine and schedule it to run immediately."""
-        return Task(
-            coro,
-            loop=loop or get_running_loop(),
-            name=name,
-            eager_start=True,  # type: ignore[call-arg]
-        )
-else:
-
-    def create_eager_task(
-        coro: Coroutine[Any, Any, _T],
-        *,
-        name: str | None = None,
-        loop: AbstractEventLoop | None = None,
-    ) -> Task[_T]:
-        """Create a task from a coroutine and schedule it to run immediately."""
-        return Task(
-            coro,
-            loop=loop or get_running_loop(),
-            name=name,
-        )
+
+def create_eager_task(
+    coro: Coroutine[Any, Any, _T],
+    *,
+    name: str | None = None,
+    loop: AbstractEventLoop | None = None,
+) -> Task[_T]:
+    """Create a task from a coroutine and schedule it to run immediately."""
+    return Task(
+        coro,
+        loop=loop or get_running_loop(),
+        name=name,
+        eager_start=True,
+    )
 
 
 def cancelling(task: Future[Any]) -> bool:
diff --git a/homeassistant/util/frozen_dataclass_compat.py b/homeassistant/util/frozen_dataclass_compat.py
index 68db3cd68322b3..fa86ce8ff87e44 100644
--- a/homeassistant/util/frozen_dataclass_compat.py
+++ b/homeassistant/util/frozen_dataclass_compat.py
@@ -8,9 +8,7 @@
 
 import dataclasses
 import sys
-from typing import Any
-
-from typing_extensions import dataclass_transform
+from typing import Any, dataclass_transform
 
 
 def _class_fields(cls: type, kw_only: bool) -> list[tuple[str, Any, Any]]:
diff --git a/mypy.ini b/mypy.ini
index a8b146059fcb4b..81f6f553eb6260 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -3,7 +3,7 @@
 # To update, run python3 -m script.hassfest -p mypy_config
 
 [mypy]
-python_version = 3.11
+python_version = 3.12
 plugins = pydantic.mypy
 show_error_codes = true
 follow_imports = silent
diff --git a/pyproject.toml b/pyproject.toml
index d6137b3d7ba1f7..965827f41eabc4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,10 +18,10 @@ classifiers = [
     "Intended Audience :: Developers",
     "License :: OSI Approved :: Apache Software License",
     "Operating System :: OS Independent",
-    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
     "Topic :: Home Automation",
 ]
-requires-python = ">=3.11.0"
+requires-python = ">=3.12.0"
 dependencies    = [
     "aiohttp==3.9.3",
     "aiohttp_cors==0.7.0",
@@ -90,7 +90,7 @@ include-package-data = true
 include = ["homeassistant*"]
 
 [tool.pylint.MAIN]
-py-version = "3.11"
+py-version = "3.12"
 ignore = [
     "tests",
 ]
@@ -705,6 +705,8 @@ ignore = [
     "UP007", # keep type annotation style as is
     # Ignored due to performance: https://github.com/charliermarsh/ruff/issues/2923
     "UP038", # Use `X | Y` in `isinstance` call instead of `(X, Y)`
+    # Ignored due to incompatible with mypy: https://github.com/python/mypy/issues/15238
+    "UP040", # Checks for use of TypeAlias annotation for declaring type aliases.
 
     # May conflict with the formatter, https://docs.astral.sh/ruff/formatter/#conflicting-lint-rules
     "W191",