# MLflow v3.15.2

- Product: MLflow (https://whatsnew.fyi/product/mlflow)
- Vendor: LF AI & Data
- Date: 2026-08-26
- Version: v3.15.2
- Original notes: https://github.com/mlflow/mlflow/releases/tag/v3.15.2
- Permalink: https://whatsnew.fyi/product/mlflow/releases/v3.15.2

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- **added** — Support immutable evaluation dataset versions
- **added** — Add scorer_ensemble primitive for combining scorer results
- **fixed** — Preserve base judge invocation flow in MemAlign aligned judges
- **fixed** — Pre-import `databricks.sdk` in Databricks to avoid telemetry deadlock
- **fixed** — Align `runs.status` constraint metadata

MLflow 3.15.2 is a patch release that includes several major features and improvements.

Features:

- [Evaluation] Support immutable evaluation dataset versions (#24845, @danielseong1)
- [Evaluation] Add scorer_ensemble primitive for combining scorer results (#24749, @alkispoly-db)

Bug fixes:

- [Evaluation] Preserve base judge invocation flow in MemAlign aligned judges (#24883, @veronicalyu320)
- [Tracking] Pre-import `databricks.sdk` in Databricks to avoid telemetry deadlock (#24841, @aaronteo-db)
- [Build / Tracking] Align `runs.status` constraint metadata (#24890, @joshuawong-db)