# DuckDB v1.5.6 Bugfix Release

> **Key Architectural Takeaway:** This is a bug fix release for various issues discovered after we released v1.5.5 What's Changed Use relative includes in unity build sources for cache reuse by @NiclasHaderer in #23972 bump vortex by @samansmink in #24089 [variegata] Remove Julia client in favor of duckdb/DuckDB.jl by @evertlammerts in #24127 [variegata] Replace the C API spec and code generation by @evertlammerts in #24131 TopNWindowElimination Fixes by @d-justen in #24080 Fix active query race by @NiclasHaderer in #24123 Fix UNNEST Pushdown by @d-justen in #24119 [Parquet][Variant] Don't produce VARIANT metadata with sorted_strings set by @Tishj in #23591 Fix LIMIT pushdown through a volatile....

**Published:** 2026-09-28T13:36:49+00:00  
**Source:** DuckDB Analytical Engine  
**Category:** databases-storage  
**Canonical URL:** https://fosswire.org/news/duckdb-v156-bugfix-release.html  

## Executive Summary
This is a bug fix release for various issues discovered after we released v1.5.5 What's Changed Use relative includes in unity build sources for cache reuse by @NiclasHaderer in #23972 bump vortex by @samansmink in #24089 [variegata] Remove Julia client in favor of duckdb/DuckDB.jl by @evertlammerts in #24127 [variegata] Replace the C API spec and code generation by @evertlammerts in #24131 TopNWindowElimination Fixes by @d-justen in #24080 Fix active query race by @NiclasHaderer in #24123 Fix UNNEST Pushdown by @d-justen in #24119 [Parquet][Variant] Don't produce VARIANT metadata with sorted_strings set by @Tishj in #23591 Fix LIMIT pushdown through a volatile...

## Architectural & Systems Analysis
From an infrastructure engineering, cloud-native scale, and hyperscale governance standpoint:

- **Hyperscale Provenance:** Open-sourcing internal frameworks subjects proprietary systems to rigorous public analysis.
- **De-facto Standard Cohesion:** Publishing enterprise tooling establishes interoperable specifications across distributed execution.
- **Vendor Decoupling:** Platform engineers can inspect underlying telemetry and memory layouts without black-box vendor lock-in.

## Impact on the Open Ecosystem
Bridges enterprise engineering scale with independent, reproducible open-source software stacks.