[dependabot]

Bumps nox from 2026.8.17 to 2026.10.20.

Release notes

Sourced from nox's releases.

2026.10.20 🐍

Parallel mode no longer prints an "experimental" banner, and sessions can check session.parallel to see if they run in a parallel worker. A new rattler backend uses py-rattler (install with the nox[rattler] extra), so you can request fast conda-style environments in a /// script block. Python versions read from classifiers now include free-threaded builds when the free-threading classifier is present, and are deduplicated. A single-argument @nox.parametrize now accepts ranges and other iterators, and the rattler backend loads config from the default locations. The GitHub Action now defaults to Python 3.11-3.15. This release also fixes several bugs in script mode, option handling, and tox-to-nox.

We'd like to thank the following folks who contributed to this release:

• @​henryiii
• @​Himanshuagrawal4
• @​Arthur031221 (first contribution)
• @​devtechedge (first contribution)
• @​dylanpulver (first contribution)
• @​leodevian (first contribution)
• @​muneikh (first contribution)
• @​nickita-khylkouski (first contribution)
• @​pcbeingused333 (first contribution)
• @​r3wretrhy (first contribution)
• @​Rodrigo-Palma (first contribution)
• @​xiehuanyi (first contribution)

Features:

• Remove the experimental banner from --parallel by @​henryiii in wntrblm/nox#1197
• Expose parallel execution state on sessions by @​nickita-khylkouski in wntrblm/nox#1182
• Add py-rattler support by @​henryiii in wntrblm/nox#1179
• Add free-threaded versions from classifiers by @​henryiii in wntrblm/nox#1185
• Expand ranges and iterators in single-argument parametrization by @​muneikh in wntrblm/nox#1206
• rattler: load config from default locations by @​leodevian in wntrblm/nox#1204
• GitHub Action: default to Python 3.11-3.15 by @​henryiii in wntrblm/nox#1205

Fixes:

• Respect directory boundaries when classifying external commands by @​xiehuanyi in wntrblm/nox#1207
• Walk a dependency's mandatory requirements even without extras by @​Arthur031221 in wntrblm/nox#1192
• Don't call install() when a script declares no dependencies by @​Rodrigo-Palma in wntrblm/nox#1188
• Read script metadata after a UTF-8 BOM by @​pcbeingused333 in wntrblm/nox#1211
• Deduplicate the python list of a session by @​henryiii in wntrblm/nox#1187
• Accept tuples for list-valued options by @​henryiii in wntrblm/nox#1176
• Fall back to ASCII for the parallel banner and status header by @​dylanpulver in wntrblm/nox#1180
• tox-to-nox: drop env vars that tox 4.64.8+ lists in set_env by @​henryiii in wntrblm/nox#1201
• tox-to-nox: keep quoted paths when converting commands by @​r3wretrhy in wntrblm/nox#1181

Documentation:

• Clarify supported session Python versions by @​Himanshuagrawal4 in wntrblm/nox#1171

Internal changes:

• Isolate envdirs and relax duration checks to fix flaky CI by @​henryiii in wntrblm/nox#1208
• Run test sessions in parallel steps in CI by @​henryiii in wntrblm/nox#1200
• Give test_interrupt_handled child more time to exit by @​henryiii in wntrblm/nox#1202
• Keep existing PYTHONPATH in test_noxfile_script_mode by @​devtechedge in wntrblm/nox#1190

... (truncated)

Changelog

Sourced from nox's changelog.

2026.10.20

Parallel mode no longer prints an "experimental" banner, and sessions can check session.parallel to see if they run in a parallel worker. A new rattler backend uses py-rattler (install with the nox[rattler] extra), so you can request fast conda-style environments in a /// script block. Python versions read from classifiers now include free-threaded builds when the free-threading classifier is present, and are deduplicated. A single-argument @nox.parametrize now accepts ranges and other iterators, and the rattler backend loads config from the default locations. The GitHub Action now defaults to Python 3.11-3.15. This release also fixes several bugs in script mode, option handling, and tox-to-nox.

We'd like to thank the following folks who contributed to this release:

• @​henryiii
• @​Himanshuagrawal4
• @​Arthur031221 (first contribution)
• @​devtechedge (first contribution)
• @​dylanpulver (first contribution)
• @​leodevian (first contribution)
• @​muneikh (first contribution)
• @​nickita-khylkouski (first contribution)
• @​pcbeingused333 (first contribution)
• @​r3wretrhy (first contribution)
• @​Rodrigo-Palma (first contribution)
• @​xiehuanyi (first contribution)

Features:

• Remove the experimental banner from --parallel by @​henryiii in wntrblm/nox#1197
• Expose parallel execution state on sessions by @​nickita-khylkouski in wntrblm/nox#1182
• Add py-rattler support by @​henryiii in wntrblm/nox#1179
• Add free-threaded versions from classifiers by @​henryiii in wntrblm/nox#1185
• Expand ranges and iterators in single-argument parametrization by @​muneikh in wntrblm/nox#1206
• rattler: load config from default locations by @​leodevian in wntrblm/nox#1204
• GitHub Action: default to Python 3.11-3.15 by @​henryiii in wntrblm/nox#1205

Fixes:

• Respect directory boundaries when classifying external commands by @​xiehuanyi in wntrblm/nox#1207
• Walk a dependency's mandatory requirements even without extras by @​Arthur031221 in wntrblm/nox#1192
• Don't call install() when a script declares no dependencies by @​Rodrigo-Palma in wntrblm/nox#1188
• Read script metadata after a UTF-8 BOM by @​pcbeingused333 in wntrblm/nox#1211
• Deduplicate the python list of a session by @​henryiii in wntrblm/nox#1187
• Accept tuples for list-valued options by @​henryiii in wntrblm/nox#1176
• Fall back to ASCII for the parallel banner and status header by @​dylanpulver in wntrblm/nox#1180
• tox-to-nox: drop env vars that tox 4.64.8+ lists in set_env by @​henryiii in wntrblm/nox#1201
• tox-to-nox: keep quoted paths when converting commands by @​r3wretrhy in wntrblm/nox#1181

... (truncated)

Commits

• afa3983 docs: prepare 2026.10.13 release notes (#1203)
• 06784f1 fix: read script metadata after a UTF-8 BOM (#1211)
• c8e1d6f test: fix flaky autospec of lazy-imported logger on 3.15 (#1209)
• db686a0 feat: expand ranges and iterators in single-argument parametrization (#1206)
• 76aec97 test: isolate envdirs and relax duration checks to fix flaky CI (#1208)
• 2b9fea6 feat(rattler): load config from default locations (#1204)
• 1c52fa7 fix: respect directory boundaries when classifying external commands (#1207)
• 7725663 feat(action): default to 3.11-3.15 (#1205)
• f85c5ef ci: run test sessions in parallel steps (#1200)
• b3e56ba test: give test_interrupt_handled child more time to exit (#1202)
• Additional commits viewable in compare view

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