PYTHON-6138 Drop Python 3.9 and 3.10 Support

[aclark4life]

PYTHON-6138

Changes in this PR

• Raise requires-python to >=3.11.
• Drop Python 3.9/3.10 from GitHub Actions matrices.
• Drop Python 3.10 from the Evergreen CPYTHONS matrix and 3.9/PyPy 3.9/PyPy 3.10 from MIN_SUPPORT_VERSIONS.
  • Regenerate .evergreen/generated_configs/.
• Regenerate uv.lock.
• Update README and changelog.

Test Plan

• GitHub Actions static, build, test_minimum, test_sdist jobs pass on 3.11.
• Evergreen patch run of regenerated config.

Checklist

Checklist for Author

• Did you update the changelog (if necessary)?
• Is the intention of the code captured in relevant tests?
• If there are new TODOs, has a related JIRA ticket been created?

Checklist for Reviewer

• Does the title of the PR reference a JIRA Ticket?
• Do you fully understand the implementation? (Would you be comfortable explaining how this code works to someone else?)
• Have you checked for spelling & grammar errors?
• Is all relevant documentation (README or docstring) updated?

[Copilot]

🟡 Changes recommended

Evergreen still defaults and pins some jobs to Python 3.10, which conflicts with the new package requirement.

3 open findings

• Update Evergreen jobs from Python 3.10 to 3.11+ · New
• Update contributor docs to require Python 3.11+ · New
• Replace stale boto3 Python-version rationale · New

What changed in this PR

Raises PyMongo’s minimum supported runtime to Python 3.11 and aligns packaging, CI, Evergreen, and documentation.

Changes:

• Sets requires-python to 3.11+ and regenerates dependencies.
• Removes Python 3.9/3.10 from CI and distribution jobs.
• Updates Evergreen matrices and release documentation.

File	Description
README.md	Updates supported versions.
pyproject.toml	Raises the Python floor and removes classifiers.
uv.lock	Regenerates dependencies for Python 3.11+.
doc/​changelog.rst	Announces dropped runtime support.
.github/​workflows/​uv-lock-update.yml	Uses Python 3.11 for lock updates.
.github/​workflows/​test-python.yml	Updates test jobs to Python 3.11+.
.github/​workflows/​sbom.yml	Uses Python 3.11 for SBOM generation.
.github/​workflows/​dist.yml	Drops 3.9/3.10 wheel assertions.
.evergreen/​scripts/​generate_config_utils.py	Updates Evergreen interpreter matrices.
.evergreen/​generated_configs/​tasks.yml	Regenerates Evergreen tasks.

🧠 Review effort: Balanced

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[codecov]

Codecov Report

❌ Patch coverage is 64.63415% with 29 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pymongo/network_layer.py	7.14%	13 Missing ⚠️
pymongo/pool_shared.py	0.00%	5 Missing ⚠️
pymongo/ocsp_cache.py	33.33%	2 Missing ⚠️
pymongo/pool_options.py	0.00%	2 Missing ⚠️
pymongo/pyopenssl_context.py	50.00%	2 Missing ⚠️
pymongo/auth_shared.py	66.66%	1 Missing ⚠️
pymongo/lock.py	0.00%	1 Missing ⚠️
pymongo/message.py	50.00%	1 Missing ⚠️
pymongo/ocsp_support.py	50.00%	1 Missing ⚠️
pymongo/periodic_executor.py	0.00%	1 Missing ⚠️

📢 Thoughts on this report? Let us know!

[blink1073]

Woohoo!