➔ Dask 2026.7.0 - Expression Protocol and Compatibility Updates
Dask 2026.7.0 was published on July 6, 2026, and the main user visible change is better expression handling through support for composite expressions with the __dask_exprs__ protocol. The release also avoids graph materialization in is_dask_collection for expression wrappers, which matters for code that probes Dask objects before doing real work. This is a normal release, not a prerelease.
➔ Polars py-1.42.1 - Panic Fixes and Parquet Metadata
Polars py-1.42.1 was published on June 30, 2026 as the Python Polars 1.42.1 release. This stable patch release is not a prerelease, and its useful theme is fewer panics around parquet scans, grouped aggregation, projection pushdown, temporal extraction, and value replacement.
➔ Polars py-1.42.0 - Cloud IO and SQL Fixes
Polars py-1.42.0 was published on June 24, 2026, as the Python Polars 1.42.0 release. The main user visible work is a mix of cloud IO control, early out of core spilling, SQL fixes, and query optimizer correctness. The release is not marked as a prerelease, so teams using Python Polars should treat it as the current stable release train and read the migration notes before upgrading.