diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index d97392248..85464aa0f 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -34,7 +34,7 @@ repos:
           - httpx~=0.23.3
           - tornado~=6.2
           - APScheduler~=3.9.1
-          - cachetools~=5.2.0
+          - cachetools~=5.2.1
           - aiolimiter~=1.0.0
           - . # this basically does `pip install -e .`
 -   repo: https://github.com/pre-commit/mirrors-mypy
@@ -50,7 +50,7 @@ repos:
           - httpx~=0.23.3
           - tornado~=6.2
           - APScheduler~=3.9.1
-          - cachetools~=5.2.0
+          - cachetools~=5.2.1
           - aiolimiter~=1.0.0
           - . # this basically does `pip install -e .`
     - id: mypy
@@ -62,7 +62,7 @@ repos:
       additional_dependencies:
         - tornado~=6.2
         - APScheduler~=3.9.1
-        - cachetools~=5.2.0
+        - cachetools~=5.2.1
         - . # this basically does `pip install -e .`
 -   repo: https://github.com/asottile/pyupgrade
     rev: v3.3.1
@@ -89,5 +89,5 @@ repos:
           - httpx~=0.23.3
           - tornado~=6.2
           - APScheduler~=3.9.1
-          - cachetools~=5.2.0
+          - cachetools~=5.2.1
           - aiolimiter~=1.0.0
diff --git a/README.rst b/README.rst
index f9f7e005d..b5d8cce26 100644
--- a/README.rst
+++ b/README.rst
@@ -151,7 +151,7 @@ PTB can be installed with optional dependencies:
 * ``pip install python-telegram-bot[socks]`` installs `httpx[socks] <https://www.python-httpx.org/#dependencies>`_. Use this, if you want to work behind a Socks5 server.
 * ``pip install python-telegram-bot[rate-limiter]`` installs `aiolimiter~=1.0.0 <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~=6.2 <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~=5.2.0 <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~=5.2.1 <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~=3.9.1 <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/requirements-opts.txt b/requirements-opts.txt
index 86b473408..4621064c3 100644
--- a/requirements-opts.txt
+++ b/requirements-opts.txt
@@ -19,7 +19,7 @@ tornado~=6.2 # webhooks!ext
 
 # Cachetools and APS don't have a strict stability policy.
 # Let's be cautious for now.
-cachetools~=5.2.0 # callback-data!ext
+cachetools~=5.2.1 # callback-data!ext
 APScheduler~=3.9.1 # job-queue!ext
 
 # pytz is required by APS and just needs the lower bound due to #2120