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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 >= 3.10andpython_version >= 3.10fromMETADATA.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,UP036inpyproject.toml. (Reenable ruff rules UP035, UP036, remove RUF100 #15715) - Remove
RUF100code from# noqadirectives. (also Reenable ruff rules UP035, UP036, remove RUF100 #15715) - Revisit Enable PYI059 #15399.
- Re-enable ruff codes
- Remove obsolete stdlib modules (see
VERSIONS). (Remove modules dropped in Python 3.10 #15710)_bootlocaledistutils.command.bdist_wininstformatterparsersymbol
- Replace
typing_extensionsimports. (Import some items from typing instead of typing_extensions #15711)ParamSpecTypeAliasTypeGuard
- Remove
builtins.ellipsisafter type checkers have switched totypes.EllipsisType. (Removebuiltins.ellipsispseudo-type #15712, see also Remove type checker-specific symbols from builtins.pyi and typing.pyi #7580) - Remove
_reader/_writerworkarounds instdlib/_csv.pyi. (Part of Drop 3.9 support in the stdlib #15708)
Removebuiltins.ellipsispseudo-type #15712
(Please amend as necessary.)
Activity
[-]Drop support for Python 3.9 (early 2026)[/-][+]Drop support for Python 3.9 (February/May 2026)[/+]Officially drop support for Python 3.9
Remove Python3.9 support from CI and tests
Officially remove Python 3.9 support
srittau commentedon Feb 9, 2026
Phase 1 is now nearly done. Only #15402 and #15403 need to be merged.
[-]Drop support for Python 3.9 (February/May 2026)[/-][+]Drop support for Python 3.9 (May 2026)[/+]Remove Python 3.9 workaround in stubtest_stdlib
Import some items from typing instead of typing_extensions (#15711)
srittau commentedon May 8, 2026
I've added
builtins.ellipsisto 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.