# DuckDB v1.5.5 — Release & Upgrade Intelligence
- **Product:** DuckDB (https://duckdb.org)
- **Version:** v1.5.5
- **Released:** Jul 22, 2026
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/duckdb/updates/v1.5.5/

## Executive Summary (TL;DR)
DuckDB v1.5.5. Source highlight: This is a bug fix release for various issues discovered after we released v1.5.4.

## New Features
- Add support for test config extending
- Add request body length to http logs
- Add additional guards to `DICT_FSST` to prevent exception during compression with small block size
- [ADBC] Add support for duckdb:// URI scheme in URI option
- [v1.5] Quickfix `ALTER TABLE ADD COLUMN IF NOT EXISTS ... DEFAULT` regression
- Add HTTPUtil::ShouldRetry(request, response) retry-classification hook

## Improvements
- Improve rle corruption error messages

## Bug Fixes
- backport the out-of-bounds security fixes made in #23100
- [Dev] Add LLDB scripts to help with debugging
- bump unity to include backfill fix
- Dispatch Rust nightly build
- Fix deadlock in `TemporaryMemoryManager`
- [Dev] Fix recursion issue with `scripts/lldb/pointer_print`