# chDB Kernel Upgrade Journey: Upgrading ClickHouse to v25.8.2.29

DevFeed: [chDB Kernel Upgrade Journey: Upgrading ClickHouse to v25.8.2.29](<https://devfeed.tech/articles/chdb-kernel-upgrade-journey-upgrading-clickhouse-to-v25-8-2-29-5036.md>)

Original publisher: [Read original article](<https://clickhouse.com/blog/chdb-kernel-update-25.8>)

Author: Victor Gao

Published: 2025-11-19T00:00:00Z

Content type: article

Language: en

Sources: [ClickHouse Blog](<https://devfeed.tech/sources/clickhouse-blog.md>)

Topics: [clickhouse](<https://devfeed.tech/topics/clickhouse.md>), [Python](<https://devfeed.tech/topics/python.md>), [SQL](<https://devfeed.tech/topics/sql.md>), [C++](<https://devfeed.tech/topics/c-plus-plus.md>), [out-of-process](<https://devfeed.tech/topics/out-of-process.md>), [parquet](<https://devfeed.tech/topics/parquet.md>), [CSV](<https://devfeed.tech/topics/csv.md>), [JSON](<https://devfeed.tech/topics/json.md>)

Tags: [blog-post](<https://devfeed.tech/tags/blog-post.md>), [c-plus-plus](<https://devfeed.tech/tags/c-plus-plus.md>), [clickhouse](<https://devfeed.tech/tags/clickhouse.md>), [compression](<https://devfeed.tech/tags/compression.md>), [json](<https://devfeed.tech/tags/json.md>), [parquet](<https://devfeed.tech/tags/parquet.md>), [python](<https://devfeed.tech/tags/python.md>), [sql](<https://devfeed.tech/tags/sql.md>), [upgrade](<https://devfeed.tech/tags/upgrade.md>)

## AI overview

This blog post describes chDB's upgrade of the embedded ClickHouse kernel from v25.5 to v25.8.2.29. It explains the in-process architecture, zero-copy data transfer between Python and C++, support for multiple data formats, and the dual dynamic-library design used to maintain compatibility across Python versions.

## Source excerpt

chDB recently upgraded the ClickHouse kernel from v25.5 to v25.8.2.29. This blog post goes through that journey.