Apache ZooKeeper

Server App

Apache ZooKeeper 3.9 is the newest actively maintained release, currently at patch 3.9.5. 2 of 6 tracked cycles remain supported.

Latest version

3.9.5

Feb 11, 2026

Actively maintained cycles

of 6 tracked

Total cycles tracked

since Nov 23, 2011

Release lifecycle

Actively maintainedSecurity support onlyEnd of life

Today

3.9Latest

3.9.5 · Feb 11, 2026

3.8

3.8.6 · Jan 28, 2026

3.7

EOL Jan 19, 2024

3.6

EOL Dec 30, 2022

3.5

EOL Jun 1, 2022

3.4

EOL Jun 1, 2020

201220132014201520162017201820192020202120222023202420252026

Data sourced from endoflife.date.

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