Drop support for Python 3.9 (May 2026) #13782
Description
Python 3.9 reached its end-of-life phase on 2025-10-31 (PEP 596).
How to remove support
February 2026
- Update the version in README.md.
- Update various fields in pyproject.toml. (Update project.requires-python to >=3.10 #15402)
- Remove 3.9 from CI and test scripts.
- Update stubtest allow lists. Also check whether items can be moved to the common allow lists. (Remove Python 3.9 stubtest allowlists #15403)
- Remove requires_python >= 3.10 and python_version >= 3.10 from METADATA.toml
May 2026
- Remove 3.9 exclusive branches from stubs. (Drop 3.9 support for third-party packages #15707, Drop 3.9 support in the stdlib #15708)
- Re-enable ruff codes UP035, UP036 in pyproject.toml. (Reenable ruff rules UP035, UP036, remove RUF100 #15715)
- Remove RUF100 code from # noqa directives. (also Reenable ruff rules UP035, UP036, remove RUF100 #15715)
- Revisit Enable PYI059 #15399.
- Remove obsolete stdlib modules (see VERSIONS). (Remove modules dropped in Python 3.10 #15710)
- _bootlocale
- distutils.command.bdist_wininst
- formatter
- parser
- symbol
- Replace typing_extensions imports. (Import some items from typing instead of typing_extensions #15711)
- ParamSpec
- TypeAlias
- TypeGuard
- Remove builtins.ellipsis after type checkers have switched to types.EllipsisType. (Remove builtins.ellipsis pseudo-type #15712, see also Remove type checker-specific symbols from builtins.pyi and typing.pyi #7580)
- Remove _reader/_writer workarounds in stdlib/_csv.pyi. (Part of Drop 3.9 support in the stdlib #15708)
Remove builtins.ellipsis pseudo-type #15712
(Please amend as necessary.)
Activity
Officially drop support for Python 3.9
Remove Python3.9 support from CI and tests
Officially remove Python 3.9 support
srittau commented on Feb 9, 2026
Phase 1 is now nearly done. Only #15402 and #15403 need to be merged.
Remove Python 3.9 workaround in stubtest_stdlib
Import some items from typing instead of typing_extensions (#15711)
srittau commented on May 8, 2026
I've added builtins.ellipsis to the checklist in #7580. (@JelleZijlstra originally listed it in the issue, but for some reason I hadn't included it in my list later in the thread.) Apart from that, Python 3.9 has now been removed.