Apache ZooKeeper
All ZooKeeper releases at a glance: release dates, number of versions, latest version, LTS status and the end-of-life (EOL) visualisation
All supported productsFree Versio.io trialWhat is ZooKeeper?
ZooKeeper is a centralized service for maintaining configuration information, naming,
providing distributed synchronization, and providing group services. All of these
kinds of services are used in some form or another by distributed applications. Each
time they are implemented there is a lot of work that goes into fixing the bugs and
race conditions that are inevitable. Because of the difficulty of implementing these
kinds of services, applications initially usually skimp on them, which make them brittle
in the presence of change and difficult to manage. Even when done correctly, different
implementations of these services lead to management complexity when the applications
are deployed.
ZooKeeper release and version history
| Release | Release date | Versions | Latest version | Latest version date | LTS |
|---|---|---|---|---|---|
| 3.9 | 2023-08-03 | 19 | 3.9.6 | 2026-09-14 | No |
| 3.8 | 2023-01-30 | 19 | 3.8.7 | 2026-10-05 | No |
| 3.7 | 2021-03-27 | 10 | 3.7.2 | 2024-02-19 | No |
| 3.6 | 2020-03-03 | 20 | 3.6.4 | 2022-12-30 | No |
| 3.5 | 2014-08-06 | 41 | 3.5.10 | 2022-06-04 | No |
| 3.4 | 2011-11-23 | 44 | 3.4.14 | 2019-04-01 | No |
| 3.3 | 2010-11-24 | 13 | 3.3.6 | 2012-08-01 | No |
Data as of 6 October 2026. Dates in ISO format (YYYY-MM-DD). Source: Versio.io product release & end-of-life database.
The entire lifecycle of the product ZooKeeper
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What is the ZooKeeper release strategy?
Facts and figures about ZooKeeper
| Product | ZooKeeper |
|---|---|
| Vendor | Apache |
| Latest version | 3.9.6 |
| Number of releases | 7 |
| Number of versions | 166 |
| Number of unstable versions | 111 |
| Number of versions affected by CVE | 89 |
| Licence | Apache License 2.0 |
| Licence details | https://en.wikipedia.org/wiki/Apache_License#Apache_License_2.0 |
| Version command | echo srvr | nc localhost 2181 |
| Wikipedia | https://en.wikipedia.org/wiki/Apache_ZooKeeper |
Frequently asked questions about Apache ZooKeeper end of life
What is the latest version of Apache ZooKeeper?
The latest version of Apache ZooKeeper is 3.9.6, released as part of the 3.9 release on 3 August 2023.
Which Apache ZooKeeper versions are still supported?
As of 6 October 2026, no Apache ZooKeeper release is within its maintenance period. Check the release table above for the latest versions.
Does Apache ZooKeeper have long-term support (LTS) releases?
No. Apache ZooKeeper does not designate long-term support releases; every release follows the standard maintenance period shown in the table.
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