# Polars 1.37.1 — Python Polars 1.37.1

- Product: Polars (https://whatsnew.fyi/product/polars)
- Vendor: Polars
- Date: 2026-01-12
- Version: 1.37.1
- Original notes: https://github.com/pola-rs/polars/releases/tag/py-1.37.1
- Permalink: https://whatsnew.fyi/product/polars/releases/1.37.1

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- **changed** — Speed up SQL interface UNION clauses
- **fixed** — Optimize slicing support on compressed IPC
- **fixed** — CPU check for musl builds
- **fixed** — Propagate C Stream import errors instead of panicking
- **fixed** — Fix slicing on compressed IPC

##### 🚀 Performance improvements

- Speed up `SQL` interface "UNION" clauses (#26039)

##### 🐞 Bug fixes

- Optimize slicing support on compressed IPC (#26071)
- CPU check for musl builds (#26076)
- Propagate C Stream import errors instead of panicking (#26036)
- Fix slicing on compressed IPC (#26066)

##### 📖 Documentation

- Clarify min\_by/max\_by behavior on ties (#26077)

##### 🛠️ Other improvements

- Mark top slow normal tests as slow (#26080)
- Update breaking deps (#26055)
- Fix for upstream url bug and update deps (#26052)
- Properly pin chrono (#26051)
- Don't run rust doctests (#26046)
- Update deps (#26042)
- Ignore very slow test (#26041)

Thank you to all our contributors for making this release possible!
@Voultapher, @alexander-beedie, @kdn36, @nameexhaustion, @orlp, @ritchie46 and @wtn