This is an older version. The current version is 1.4.0. Pyrefly 1.4.0 · Released:
Installer files 1.1.1
| Architecture | Type | Scope | File size | Download | SHA256 |
|---|---|---|---|---|---|
| 64-bit | ZIP → Portable | — | — | github.com | VirusTotal |
| ARM64 | ZIP → Portable | — | — | github.com | VirusTotal |
Link and SHA256 come from the Windows Package Manager community manifest. Compare the hash of the downloaded file before running it.
Release notes
Release date: June 18, 2026
Pyrefly v1.1.1 is a patch release with a single bug fix.
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## 🐛 Bug fixes
- #3867: Fixed a regression introduced in 1.1.0 where isinstance() narrowing of a union variable
silently stopped working when an earlier sibling branch in the same if/elif/else chain narrowed
a different variable with isinstance() and returned. The later narrowing left the union
untouched, producing false missing-attribute errors on code that checked correctly in 1.0.0.
Thank-you to all our contributors who found these bugs and reported them! Did you know this is one
of the most helpful contributions you can make to an open-source project? If you find any bugs in
Pyrefly we want to know about them! Please open a bug report issue here.
