# ClickHouse Release 25.4

DevFeed: [ClickHouse Release 25.4](<https://devfeed.tech/articles/clickhouse-release-25-4-5121.md>)

Original publisher: [Read original article](<https://clickhouse.com/blog/clickhouse-release-25-04>)

Author: ClickHouse

Published: 2025-05-09T00:00:00Z

Content type: release

Language: en

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

Topics: [clickhouse](<https://devfeed.tech/topics/clickhouse.md>), [Optimization](<https://devfeed.tech/topics/optimization.md>), [Apache Iceberg](<https://devfeed.tech/topics/apache-iceberg.md>), [datasets](<https://devfeed.tech/topics/datasets.md>), [Sorting](<https://devfeed.tech/topics/sorting.md>)

Tags: [apache-iceberg](<https://devfeed.tech/tags/apache-iceberg.md>), [bug-fixes](<https://devfeed.tech/tags/bug-fixes.md>), [clickhouse](<https://devfeed.tech/tags/clickhouse.md>), [optimization](<https://devfeed.tech/tags/optimization.md>), [performance](<https://devfeed.tech/tags/performance.md>), [release](<https://devfeed.tech/tags/release.md>), [sorting](<https://devfeed.tech/tags/sorting.md>)

## AI overview

ClickHouse 25.4 introduces 25 new features, 23 performance optimizations, and 58 bug fixes. Highlights include lazy materialization, Apache Iceberg time travel, correlated subqueries, and support for refreshing MergeTree data on read-only disks.

## Source excerpt

ClickHouse 25.4 is out! In this post, we highlight lazy materialization, Apache Iceberg time travel, correlated subqueries for the `EXISTS` clause, and more!