[release/v7.4.21] Change Windows CI to stop using PowerShell 5.1 - #28049
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Aditya Patwardhan (adityapatwardhan) merged 1 commit intoSep 22, 2026
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🔵 Needs a closer look
The change alters the PowerShell host used by Windows CI and requires final human validation.
Review effort: Lite
Findings: None
What changed in this PR
Updates Windows CI to use PowerShell Core instead of Windows PowerShell 5.1.
Changes:
- Changes the Windows bootstrap shell to
pwsh. - Removes obsolete PowerShell 5.1 documentation.
| File | Description |
|---|---|
tools/WindowsCI.psm1 |
Removes obsolete host requirement documentation. |
.github/actions/test/windows/action.yml |
Runs Windows bootstrap using PowerShell Core. |
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Aditya Patwardhan (adityapatwardhan)
enabled auto-merge (squash)
September 22, 2026 19:19
Patrick Meinecke (SeeminglyScience)
approved these changes
Sep 22, 2026
Aditya Patwardhan (adityapatwardhan)
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Aditya Patwardhan (adityapatwardhan)
changed the title
Aditya Patwardhan (adityapatwardhan)
merged commit Sep 22, 2026
b6fd898
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PowerShell:release/v7.4.21
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Aditya Patwardhan (adityapatwardhan)
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September 22, 2026 20:20
Justin Chung (jshigetomi)
approved these changes
Sep 23, 2026
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Backport of #27940 to release/v7.4.21
Triggered by Aditya Patwardhan (@adityapatwardhan) on behalf of Dongbo Wang (@daxian-dbw)
Original CL Label: CL-BuildPackaging
/cc @PowerShell/powershell-maintainers
Impact
REQUIRED: Choose either Tooling Impact or Customer Impact (or both). At least one checkbox must be selected.
Tooling Impact
Stops Windows CI from depending on Windows PowerShell 5.1 and uses the supported PowerShell Core execution path for release-branch validation.
Customer Impact
Regression
REQUIRED: Check exactly one box.
This is not a regression.
Testing
Cherry-pick completed cleanly, git diff --check passed, and tools/WindowsCI.psm1 parses successfully with no conflict markers. Windows workflow execution will be validated by backport CI.
Risk
REQUIRED: Check exactly one box.
High risk because this changes the PowerShell host used by Windows CI. The implementation is narrowly scoped to the workflow action and WindowsCI module adjustment already validated on master.