[dependabot]

Bumps virtualenv from 20.28.1 to 21.15.6.

Release notes

Sourced from virtualenv's releases.

21.15.6

Bug fixes

• Clear inherited PYTHONHOME during PowerShell, Nushell, and programmatic activation so child interpreters use the environment's standard library. Preserve empty values when Bash and fish deactivate (#3517) by @​gaborbernat.
• Remove empty PATH entries during programmatic activation, including entries in an otherwise nonempty value. On POSIX, an empty entry searches the current directory (#3513) by @​qodelicious and @​gaborbernat.
• Unset PYTHONHOME during C shell activation and restore its original value on deactivation. An inherited value could previously prevent the environment's Python interpreter from starting (#3514) by @​abhishekcpp007 and @​gaborbernat.

New Contributors

• @​abhishekcpp007 made their first contribution in pypa/virtualenv#3514

🐍 PyPI release

📜 Full Changelog

21.15.5

🐍 PyPI release

📜 Full Changelog

21.15.4

Bug fixes

• Upgrade embedded wheels: pip to 26.3 from 26.2.2 (#3508) by @​gaborbernat.

🐍 PyPI release

📜 Full Changelog

21.15.3

Bug fixes

• Add the environment's lib/pkgconfig to PKG_CONFIG_PATH when activating from xonsh, and restore the previous value or unset it again on deactivate, as the other activators already do (#3505) by @​darrenhuai and @​gaborbernat.
• Read virtualenv.ini values without interpolation, as environment variables and command line flags already are. A value holding a %, such as prompt = 50% done, was ignored without any message. %% and %(name)s are now kept as written, so write a single % (#3501) by @​darrenhuai and @​gaborbernat.
• Reject a destination that already exists but is not a directory, such as /dev/null, a FIFO or a socket, or that sits inside one, with a usage error instead of a NotADirectoryError once creation has started. A regular file now gets the same is not a directory message instead of is a file (#3504) by @​darrenhuai and @​gaborbernat.
• Set TCL_LIBRARY and TK_LIBRARY to the interpreter's Tcl/Tk paths in activate.nu, as the other activators do. Nushell activation used to leave both variables as they were (#3502) by @​darrenhuai and @​gaborbernat.
• Show the environment name in the zsh prompt when KSH_ARRAYS is set at activation. Since 21.14.13 the prompt read an empty psvar entry under that option and showed () instead of the name (#3506) by @​PDGGK and @​gaborbernat.
• Treat an empty or blank VIRTUALENV_OVERRIDE_APP_DATA and an empty VIRTUALENV_CONFIG_FILE as unset, as virtualenv already does for its option variables. An empty app-data override, or on Windows one made of spaces, made the current directory the cache, so --reset-app-data deleted it, and an empty config file path logged an error on every run (#3503) by @​darrenhuai and @​gaborbernat.

New Contributors

• @​duriantaco made their first contribution in pypa/virtualenv#3500
• @​PDGGK made their first contribution in pypa/virtualenv#3506

... (truncated)

Changelog

Sourced from virtualenv's changelog.

################# Release History #################

.. towncrier-draft-entries:: [UNRELEASED DRAFT]

.. towncrier release notes start

.. _release-21-15-6:

---

21.15.6 (2026-11-06)

---

.. _release-21-15-6-fixed:

Fixed

• Clear inherited PYTHONHOME during PowerShell, Nushell, and programmatic activation so child interpreters use the environment's standard library. Preserve empty values when Bash and fish deactivate (:pr:3517) by :user:gaborbernat.
• Remove empty PATH entries during programmatic activation, including entries in an otherwise nonempty value. On POSIX, an empty entry searches the current directory (:pr:3513) by :user:qodelicious and :user:gaborbernat.
• Unset PYTHONHOME during C shell activation and restore its original value on deactivation. An inherited value could previously prevent the environment's Python interpreter from starting (:pr:3514) by :user:abhishekcpp007 and :user:gaborbernat.

.. _release-21-15-5:

---

21.15.5 (2026-11-04)

---

.. _release-21-15-4:

---

21.15.4 (2026-11-04)

---

.. _release-21-15-4-fixed:

Fixed

• Upgrade embedded wheels: pip to 26.3 from 26.2.2 (:pr:3508) by :user:gaborbernat.

.. _release-21-15-3:

---

... (truncated)

Commits

• 9a4852e release 21.15.6
• d35766c 🔒 fix(docker): pin scanner image and pip installs (#3516)
• 6c160e5 ⚡ ci: install only the changelog hook when preparing (#3518)
• 9085728 🐛 fix(cshell): unset PYTHONHOME on activation (#3514)
• 2807baf 🐛 fix(activation): clear inherited PYTHONHOME (#3517)
• fd94ac7 👷 ci: dry-run the release in the PR gate (#3515)
• b61fb37 🐛 fix(activation): remove empty PATH entries (#3513)
• e271072 👷 ci: run release notes before PyPI publish (#3511)
• 6e4676c 👷 ci: run nightly checks in the overnight window (#3512)
• 9d8386c release 21.15.5
• Additional commits viewable in compare view

Most Recent Ignore Conditions Applied to This Pull Request

Dependency Name	Ignore Conditions
virtualenv	[>= 20.29.dev0, < 20.30]
virtualenv	[>= 20.30.dev0, < 20.31]

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