Bump virtualenv from 20.39.0 to 21.0.0

[dependabot]

Bumps virtualenv from 20.39.0 to 21.0.0.

Release notes

Sourced from virtualenv's releases.

21.0.0

What's Changed

• ♻️ refactor(discovery): extract py_discovery as self-contained package by @​gaborbernat in pypa/virtualenv#3070
• 📝 docs(changelog): add removal entry for python-discovery extraction by @​gaborbernat in pypa/virtualenv#3074

Full Changelog: pypa/virtualenv@20.39.1...21.0.0

20.39.1

What's Changed

• Align dependency versions across projects by @​gaborbernat in pypa/virtualenv#3069
• ✨ feat(create): add RustPython support by @​gaborbernat in pypa/virtualenv#3071
• 🐛 fix(create): add pythonw3.exe to Windows venvs by @​gaborbernat in pypa/virtualenv#3073

Full Changelog: pypa/virtualenv@20.39.0...20.39.1

Changelog

Sourced from virtualenv's changelog.

Deprecations and Removals - 21.0.0

• The Python discovery logic has been extracted into a standalone python-discovery package on PyPI (documentation <https://python-discovery.readthedocs.io/>_) and is now consumed as a dependency. If you previously imported discovery internals directly (e.g. from virtualenv.discovery.py_info import PythonInfo), switch to from python_discovery import PythonInfo. Backward-compatibility re-export shims are provided at virtualenv.discovery.py_info, virtualenv.discovery.py_spec, and virtualenv.discovery.cached_py_info, however these are considered unsupported and may be removed in a future release - by :user:gaborbernat. (:issue:3070)

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v20.39.1 (2026-02-25)

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Features - 20.39.1

• Add support for creating virtual environments with RustPython - by :user:elmjag. (:issue:3010)

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v20.39.0 (2026-02-23)

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Commits

• 7687420 release 21.0.0
• 8ec3142 📝 docs(changelog): add removal entry for python-discovery extraction (#3074)
• f89d46c ♻️ refactor(discovery): extract py_discovery as self-contained package (#3070)
• 0272c72 release 20.39.1
• b1ca37f 🐛 fix(create): add pythonw3.exe to Windows venvs (#3073)
• 1d4a338 ✨ feat(create): add RustPython support (#3071)
• a10c5d4 Align dependency versions across projects (#3069)
• 22a8860 [pre-commit.ci] pre-commit autoupdate (#3068)
• See full diff in compare view

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Resolves #3074
Resolves #3070
Resolves #3073
Resolves #3071
Resolves #3069
Resolves #3068
Resolves pypa/virtualenv#3070
Resolves pypa/virtualenv#3074
Resolves pypa/virtualenv#3069
Resolves pypa/virtualenv#3071
Resolves pypa/virtualenv#3073

[github-actions]

🤖 Claude Code Review

Code Review

Code Quality

• ✅ Style guide: Simple dependency version bump, no style concerns.
• ✅ No commented-out code
• ✅ Meaningful variable names: N/A
• ✅ DRY principle: N/A
• ✅ Defects: No logic errors. This is a straightforward dependency update for virtualenv from 20.39.0 to 21.0.0. Note this is a major version bump (20.x → 21.x), which may include breaking changes. However, since virtualenv is a development dependency only (under [development]), the blast radius is limited to the dev/CI environment.

Testing

• ✅ Unit/integration tests: N/A for a dependency bump
• ✅ Coverage: N/A

Documentation

• ✅ README: No update needed for a dev dependency bump
• ❌ CHANGELOG.md: No CHANGELOG.md update is included. Dependency bumps are typically noted in changelogs. However, looking at the recent commit history, these bumps appear to be automated (Dependabot-style), so this may be acceptable per project convention.

Security

• ✅ No hardcoded credentials
• ✅ No license files (.lic) or AQAAAD strings
• ✅ No sensitive data

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Summary: This is a clean, minimal dev-dependency version bump. The only flag worth noting is the major version jump (20.x → 21.x) — confirm that virtualenv==21.0.0 is compatible with the CI matrix (Python 3.10–3.13) and doesn't introduce breaking changes in your toolchain. No blockers.

Automated code review analyzing defects and coding standards