diff --git a/README.rst b/README.rst
index f41e1288f7a..d96b4d47ace 100644
--- a/README.rst
+++ b/README.rst
@@ -157,7 +157,7 @@ PTB can be installed with optional dependencies:
 * ``pip install "python-telegram-bot[http2]"`` installs `httpx[http2] <https://www.python-httpx.org/#dependencies>`_. Use this, if you want to use HTTP/2.
 * ``pip install "python-telegram-bot[rate-limiter]"`` installs `aiolimiter~=1.1.0 <https://aiolimiter.readthedocs.io/en/stable/>`_. Use this, if you want to use ``telegram.ext.AIORateLimiter``.
 * ``pip install "python-telegram-bot[webhooks]"`` installs the `tornado~=6.4 <https://www.tornadoweb.org/en/stable/>`_ library. Use this, if you want to use ``telegram.ext.Updater.start_webhook``/``telegram.ext.Application.run_webhook``.
-* ``pip install "python-telegram-bot[callback-data]"`` installs the `cachetools>=5.3.3,<5.5.0 <https://cachetools.readthedocs.io/en/latest/>`_ library. Use this, if you want to use `arbitrary callback_data <https://github.com/python-telegram-bot/python-telegram-bot/wiki/Arbitrary-callback_data>`_.
+* ``pip install "python-telegram-bot[callback-data]"`` installs the `cachetools>=5.3.3,<5.6.0 <https://cachetools.readthedocs.io/en/latest/>`_ library. Use this, if you want to use `arbitrary callback_data <https://github.com/python-telegram-bot/python-telegram-bot/wiki/Arbitrary-callback_data>`_.
 * ``pip install "python-telegram-bot[job-queue]"`` installs the `APScheduler~=3.10.4 <https://apscheduler.readthedocs.io/en/3.x/>`_ library and enforces `pytz>=2018.6 <https://pypi.org/project/pytz/>`_, where ``pytz`` is a dependency of ``APScheduler``. Use this, if you want to use the ``telegram.ext.JobQueue``.
 
 To install multiple optional dependencies, separate them by commas, e.g. ``pip install "python-telegram-bot[socks,webhooks]"``.
diff --git a/pyproject.toml b/pyproject.toml
index 9285497dfad..80edfde44f8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -67,7 +67,7 @@ all = [
 ]
 callback-data = [
     # Cachetools doesn't have a strict stability policy. Let's be cautious for now.
-    "cachetools>=5.3.3,<5.5.0",
+    "cachetools>=5.3.3,<5.6.0",
 ]
 ext = [
     "python-telegram-bot[callback-data,job-queue,rate-limiter,webhooks]",