# DuckDB v1.5.6 — Release & Upgrade Intelligence
- **Product:** DuckDB (https://duckdb.org)
- **Version:** v1.5.6
- **Released:** Sep 28, 2026
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/duckdb/updates/v1.5.6/

## Executive Summary (TL;DR)
DuckDB v1.5.6. Source highlight: This is a bug fix release for various issues discovered after we released v1.5.5

## New Features
- Add v1.5.6 storage
- Backport #24194: Add `enable_optimistic_write` setting

## Bug Fixes
- TopNWindowElimination Fixes
- Fix active query race
- Fix UNNEST Pushdown
- Fix LIMIT pushdown through a volatile projection with an OFFSET
- fix(adbc): return a dense union from ConnectionGetInfo
- Fix #24363: Preserve NULLs in Top-N window elimination when ORDER BY expression has no column references