diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 670fd15..169a907 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11"]
+        python-version: ["3.11", "3.12"]
 
     steps:
     - uses: actions/checkout@v3
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 829e07b..673eb99 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## unreleased
+
+* [Support python 3.12, drop 3.9 and 3.10](https://github.com/anna-money/aio-background/pull/231)
+
+
 ## v0.0.9 (2022-11-18)
 
 * [Support python 3.11]
diff --git a/Makefile b/Makefile
index db8b0b4..634279b 100644
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,7 @@ test:
 	@python3 -m pytest -vv --rootdir tests .
 
 pyenv:
-	echo aio-background > .python-version && pyenv install -s 3.11 && pyenv virtualenv -f 3.11 aio-background
+	echo aio-background > .python-version && pyenv install -s 3.12 && pyenv virtualenv -f 3.12 aio-background
 
 pyenv-delete:
 	pyenv virtualenv-delete -f aio-background
diff --git a/aio_background/aiohttp.py b/aio_background/aiohttp.py
index ac63382..7cf165b 100644
--- a/aio_background/aiohttp.py
+++ b/aio_background/aiohttp.py
@@ -1,5 +1,5 @@
 import uuid
-from typing import Any, AsyncIterator, Callable, Coroutine, Union
+from typing import Any, AsyncIterator, Callable, Coroutine
 
 import aiohttp.web
 
@@ -9,7 +9,7 @@
 
 
 def setup_ctx(
-    job_or_factory: Union[Job, Callable[[aiohttp.web.Application], Coroutine[Any, Any, Job]]],
+    job_or_factory: Job | Callable[[aiohttp.web.Application], Coroutine[Any, Any, Job]],
     *,
     timeout: float = 0.5,
 ) -> Callable[[aiohttp.web.Application], AsyncIterator[None]]:
diff --git a/aio_background/job.py b/aio_background/job.py
index 5f62d9a..a6b42d0 100644
--- a/aio_background/job.py
+++ b/aio_background/job.py
@@ -15,36 +15,36 @@ async def close(self, *, timeout: float = 0.5) -> bool: ...
 
 
 class SingleTaskJob(Job):
-    __slots__ = ("_task",)
+    __slots__ = ("__task",)
 
     def __init__(self, task: asyncio.Task[None]):
-        self._task = task
+        self.__task = task
 
     @property
     def is_running(self) -> bool:
-        return not self._task.done()
+        return not self.__task.done()
 
     async def close(self, *, timeout: float = 0.5) -> bool:
-        if self._task.done():
+        if self.__task.done():
             return True
 
-        self._task.cancel()
-        await asyncio.wait({self._task}, timeout=timeout)
-        return self._task.done()
+        self.__task.cancel()
+        await asyncio.wait({self.__task}, timeout=timeout)
+        return self.__task.done()
 
 
 class CombinedJob(Job):
-    __slots__ = ("_jobs",)
+    __slots__ = ("__jobs",)
 
     def __init__(self, jobs: Collection[Job]):
-        self._jobs = jobs
+        self.__jobs = jobs
 
     @property
     def is_running(self) -> bool:
-        return all(job.is_running for job in self._jobs)
+        return all(job.is_running for job in self.__jobs)
 
     async def close(self, *, timeout: float = 0.5) -> bool:
-        tasks = [asyncio.create_task(job.close(timeout=timeout)) for job in self._jobs]
+        tasks = [asyncio.create_task(job.close(timeout=timeout)) for job in self.__jobs]
         closed = True
         for task in tasks:
             closed &= await task
diff --git a/setup.py b/setup.py
index 678f863..0d51d39 100644
--- a/setup.py
+++ b/setup.py
@@ -37,8 +37,8 @@ def read_version():
     long_description=long_description,
     long_description_content_type="text/markdown",
     platforms=["macOS", "POSIX", "Windows"],
-    author="Yury Pliner",
-    python_requires=">=3.9",
+    author="Iurii Pliner",
+    python_requires=">=3.11",
     project_urls={},
     author_email="yury.pliner@gmail.com",
     license="MIT",
@@ -52,9 +52,8 @@ def read_version():
         "Intended Audience :: Developers",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3 :: Only",
-        "Programming Language :: Python :: 3.9",
-        "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
         "Operating System :: OS Independent",
         "Environment :: Web Environment",
         "Development Status :: 5 - Production/Stable",