# What's New in Apache Pulsar 4.1

DevFeed: [What's New in Apache Pulsar 4.1](<https://devfeed.tech/articles/what-s-new-in-apache-pulsar-4-1-12765.md>)

Original publisher: [Read original article](<https://pulsar.apache.org/blog/2025/09/09/announcing-apache-pulsar-4-1/>)

Author: David Kjerrumgaard

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

Content type: release

Language: en

Sources: [Apache Pulsar Blog](<https://devfeed.tech/sources/apache-pulsar-blog.md>)

Topics: [Apache Pulsar](<https://devfeed.tech/topics/pulsar.md>), [SDKs](<https://devfeed.tech/topics/sdks.md>), [Security](<https://devfeed.tech/topics/security.md>), [Grafana Cloud Metrics](<https://devfeed.tech/topics/grafana-cloud-metrics.md>), [Resilience](<https://devfeed.tech/topics/resilience.md>), [WebSocket](<https://devfeed.tech/topics/websocket.md>)

Tags: [announce](<https://devfeed.tech/tags/announce.md>), [apache](<https://devfeed.tech/tags/apache.md>), [api](<https://devfeed.tech/tags/api.md>), [authentication](<https://devfeed.tech/tags/authentication.md>), [bug-fixes](<https://devfeed.tech/tags/bug-fixes.md>), [cli](<https://devfeed.tech/tags/cli.md>), [configuration](<https://devfeed.tech/tags/configuration.md>), [encryption](<https://devfeed.tech/tags/encryption.md>), [java](<https://devfeed.tech/tags/java.md>), [launch](<https://devfeed.tech/tags/launch.md>), [monitoring](<https://devfeed.tech/tags/monitoring.md>), [new-features](<https://devfeed.tech/tags/new-features.md>), [observability](<https://devfeed.tech/tags/observability.md>), [performance](<https://devfeed.tech/tags/performance.md>), [release](<https://devfeed.tech/tags/release.md>), [resilience](<https://devfeed.tech/tags/resilience.md>), [schema](<https://devfeed.tech/tags/schema.md>), [sdk](<https://devfeed.tech/tags/sdk.md>), [security](<https://devfeed.tech/tags/security.md>), [websocket](<https://devfeed.tech/tags/websocket.md>)

## AI overview

Apache Pulsar 4.1 is a feature release with 19 approved Pulsar Improvement Proposals, bug fixes, security updates, and performance improvements. Highlights include stronger WebSocket token security, enhanced encryption handling, client configuration and resilience improvements, third-party schema registry support, Java 17 as the minimum for the Java client SDK, improved storage management, monitoring, and topic policies.

## Source excerpt

The Apache Pulsar community is thrilled to announce the launch of Apache Pulsar 4.1, a significant feature release!