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ZooKeeper
Active
Middleware Latest Version: 3.9.4 Latest Release: Aug 19, 2025
Apache ZooKeeper is a centralized service for distributed configuration, synchronization, and naming registry.
Versions
6
Latest Version
3.9.4
Active Support
2
EOL
4
Lifecycle Timeline
Today ↓
3.9
3.9
3.8
3.8
3.7
3.7
3.6
3.6
3.5
3.5
3.4
3.4
Active SupportSecurity SupportEOL
Versions
| Release | Release Date | Active Support | EOL | Latest Version | LTS | Status |
|---|---|---|---|---|---|---|
| 3.9 | Jul 19, 2023 | Yes | No | 3.9.4 | No | Active |
| 3.8 | Feb 25, 2022 | Yes | No | 3.8.5 | No | Active |
| 3.7 | Mar 17, 2021 | Jul 19, 2023 | Jan 19, 2024 | 3.7.2 | No | EOL |
| 3.6 | Feb 25, 2020 | Mar 7, 2022 | Dec 30, 2022 | 3.6.4 | No | EOL |
| 3.5 | May 3, 2019 | Mar 27, 2021 | Jun 1, 2022 | 3.5.10 | No | EOL |
| 3.4 | Nov 23, 2011 | Mar 27, 2020 | Jun 1, 2020 | 3.4.14 | No | EOL |
Frequently Asked Questions
Which versions of ZooKeeper have reached end of life?
The following ZooKeeper versions have reached end of life and no longer receive security updates: 3.7, 3.6, 3.5, 3.4. It is recommended to upgrade to a supported version.
Is it safe to continue using ZooKeeper 3.7?
ZooKeeper 3.7 has reached end of life and no longer receives security patches or bug fixes. Continuing to use it may expose your systems to known vulnerabilities. We strongly recommend upgrading to a supported version.
What is the latest version of ZooKeeper?
The latest version of ZooKeeper is 3.9.4, released in the 3.9 release cycle.
How many versions of ZooKeeper are currently supported?
ZooKeeper currently has 2 actively supported version(s): 3.9, 3.8.
When does ZooKeeper 3.9 reach end of life?
ZooKeeper 3.9 does not have a specific end-of-life date announced yet.
What should I do when ZooKeeper reaches end of life?
When a ZooKeeper version reaches end of life, you should: 1) Plan your migration to a supported version as soon as possible. 2) Review the release notes for breaking changes. 3) Test your applications thoroughly in a staging environment. 4) Update your dependencies to ensure compatibility with the new version.