diff --git a/README.md b/README.md
index 49993e8fb9..b8fed97512 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 [![CircleCI](https://circleci.com/gh/digitalfabrik/integreat-cms.svg?style=shield)](https://circleci.com/gh/digitalfabrik/integreat-cms)
-[![Ruff](https://img.shields.io/badge/ruff-10.00-brightgreen)](https://docs.astral.sh/ruff/)
+[![Ruff](https://img.shields.io/badge/ruff-0.9.1-brightgreen)](https://docs.astral.sh/ruff/)
 ![Coverage](https://img.shields.io/codeclimate/coverage/digitalfabrik/integreat-cms)
 [![PyPi](https://img.shields.io/pypi/v/integreat-cms.svg)](https://pypi.org/project/integreat-cms/)
 [![Release Notes](https://img.shields.io/badge/%F0%9F%93%9C-release%20notes-blue)](https://digitalfabrik.github.io/integreat-cms/release-notes.html)
diff --git a/docs/src/code-style.rst b/docs/src/code-style.rst
index 10017e45d5..9cbddcd636 100644
--- a/docs/src/code-style.rst
+++ b/docs/src/code-style.rst
@@ -2,6 +2,8 @@
 Code Style Guidelines
 *********************
 
+.. _ruff:
+
 Ruff
 ------
 
@@ -15,6 +17,8 @@ If you want to lint your code and apply the formatting without committing, use o
     ./tools/ruff.sh
 
 
+.. _djlint:
+
 DjLint
 ------
 
diff --git a/docs/src/git-flow.rst b/docs/src/git-flow.rst
index 1c3a539dc3..1caa78cbb8 100644
--- a/docs/src/git-flow.rst
+++ b/docs/src/git-flow.rst
@@ -94,7 +94,7 @@ All hooks for this repository are defined in :github-source:`.pre-commit-config.
 At the moment, the following hooks are configured:
 
 * ``shellcheck``: a static analysis tool for shell scripts  (see: :ref:`shellcheck` and `ShellCheck wiki <https://github.com/koalaman/shellcheck/wiki>`_)
-* ``ruff``: A formatter and linter which applies automatic code formatting to Python files (see :ref:`ruff-code-style`)
+* ``ruff``: A formatter and linter which applies automatic code formatting to Python files (see :ref:`ruff`)
 * ``prettier``: A formatter which applies automatic code formatting to CSS/JS files (see :ref:`prettier-code-style`)
 * ``djlint``: A formatter which applies automatic code formatting to Django HTML templates (see :ref:`djlint`)
 * ``translations`` A script which checks whether the translation file is up-to-date (see: :doc:`internationalization` and :ref:`translations`)
diff --git a/integreat_cms/README.md b/integreat_cms/README.md
index 371586abfa..82fd321db2 100644
--- a/integreat_cms/README.md
+++ b/integreat_cms/README.md
@@ -1,5 +1,5 @@
 [![CircleCI](https://circleci.com/gh/digitalfabrik/integreat-cms.svg?style=shield)](https://circleci.com/gh/digitalfabrik/integreat-cms)
-[![Ruff](https://img.shields.io/badge/ruff-10.00-brightgreen)](https://docs.astral.sh/ruff/)
+[![Ruff](https://img.shields.io/badge/ruff-0.9.1-brightgreen)](https://docs.astral.sh/ruff/)
 ![Coverage](https://img.shields.io/codeclimate/coverage/digitalfabrik/integreat-cms)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 
diff --git a/integreat_cms/integreat_celery/celery.py b/integreat_cms/integreat_celery/celery.py
index f78112f2ee..7aca36bde7 100644
--- a/integreat_cms/integreat_celery/celery.py
+++ b/integreat_cms/integreat_celery/celery.py
@@ -3,18 +3,21 @@
 
 Usage example:
 
-@app.task
-def wrapper_create_statistics():
-   print("create statistics")
-
-
-@app.on_after_configure.connect
-def setup_periodic_tasks(sender, **kwargs):
-   sender.add_periodic_task(
-       84600,
-       wrapper_create_statistics.s(),
-       name="wrapper_create_statistics",
-   )
+.. code-block:: python
+
+    @app.task
+    def wrapper_create_statistics():
+       print("create statistics")
+
+
+    @app.on_after_configure.connect
+    def setup_periodic_tasks(sender, **kwargs):
+       sender.add_periodic_task(
+           84600,
+           wrapper_create_statistics.s(),
+           name="wrapper_create_statistics",
+       )
+
 """
 
 import configparser