At the start of the 2023.2 development cycle, the current :ref:`LTS or stable
distribution <pti-linux-distros>` versions are:
* Ubuntu 22.04
* Debian 11
Additional testing for smooth upgrade
-------------------------------------
None
Best Effort
-----------
This distribution list is the best effort to test them in OpenStack CI/CD. These may not be part of integrated testing and may be tested periodically only.
* CentOS Stream 9
* Rocky Linux 9
Python Runtimes for 2023.2
==========================
It is the :doc:`policy <../../resolutions/20181024-python-update-process>` that
each OpenStack release cycle will target the latest available version of
Python; default Python runtimes on the distributions listed above; and versions
used in integration tests at the start of the cycle, at least until the point
when all projects have migrated to a later version.
Based on the criteria above, all Python-based projects must target and test
against, at a minimum:
* Python 3.9 (available as default in Debian 11)
* Python 3.10 (available as default in Ubuntu 22.04)