======================= Tested Runtimes for Zed ======================= At the start of the Zed development cycle, the current :ref:`LTS or stable distribution ` versions are: * Ubuntu 20.04 * CentOS Stream 9 * Debian 11 Python Runtimes for Zed ======================= 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 3.8 (available as default in Ubuntu 20.04) * Python 3.9 (available as default in Debian 11 and CentOS Stream 9) More details on Python requirements can be found in :ref:`pti-python`. Node.js Runtime for Zed ======================= Based on the available versions of Node.js supported in our :ref:`LTS or stable distributions ` all JavaScript testing should target: * Node.js 16 More details on Javascript requirements can be found in :ref:`pti-javascript`. Golang Runtime for Zed ====================== At this time, there are still frequent releases of Go with a wide variety of distribution packaged versions. Given the current state of Go support and the number of projects within OpenStack using Go, no formal version declaration is being made at this time. More details on Go requirements can be found in :ref:`pti-golang`.