IBM zOS
All zOS 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 zOS?
z/OS is a 64-bit operating system for IBM z/Architecture mainframes, introduced by
IBM in October 2000. It derives from and is the successor to OS/390, which in turn
was preceded by a string of MVS versions. Like OS/390, z/OS combines a number of formerly
separate, related products, some of which are still optional. z/OS has the attributes
of modern operating systems, but also retains much of the older functionality originated
in the 1960s and still in regular use—z/OS is designed for backward compatibility.
zOS release and version history
| Release | Release date | Versions | Latest version | Latest version date | LTS |
|---|---|---|---|---|---|
| 3.2 | 2025-09-30 | 1 | 3.2.0 | 2025-09-30 | No |
| 3.1 | 2023-09-29 | 1 | 3.1.0 | 2023-09-29 | No |
| 2.5 | 2021-07-17 | 1 | 2.5.0 | 2021-07-17 | No |
| 2.4 | 2019-09-30 | 1 | 2.4.0 | 2019-09-30 | No |
| 2.3 | 2017-09-29 | 1 | 2.3.0 | 2017-09-29 | No |
| 2.2 | 2015-09-30 | 1 | 2.2.0 | 2015-09-30 | No |
| 2.1 | 2013-09-30 | 1 | 2.1.0 | 2013-09-30 | No |
| 1.13 | 2011-09-30 | 1 | 1.13.0 | 2011-09-30 | No |
| 1.12 | 2010-09-30 | 1 | 1.12.0 | 2010-09-30 | No |
| 1.11 | 2009-09-30 | 1 | 1.11.0 | 2009-09-30 | No |
| 1.10 | 2008-09-30 | 1 | 1.10.0 | 2008-09-30 | No |
| 1.9 | 2007-09-30 | 1 | 1.9.0 | 2007-09-30 | No |
| 1.8 | 2006-09-30 | 1 | 1.8.0 | 2006-09-30 | No |
| 1.7 | 2005-09-30 | 1 | 1.7.0 | 2005-09-30 | No |
| 1.6 | 2004-09-30 | 1 | 1.6.0 | 2004-09-30 | No |
| 1.5 | 2004-03-30 | 1 | 1.5.0 | 2004-03-30 | No |
| 1.4 | 2002-09-30 | 1 | 1.4.0 | 2002-09-30 | No |
| 1.3 | 2002-03-30 | 1 | 1.3.0 | 2002-03-30 | No |
| 1.2 | 2001-10-30 | 1 | 1.2.0 | 2001-10-30 | No |
| 1.1 | 2001-03-30 | 1 | 1.1.0 | 2001-03-30 | No |
Data as of 11 October 2026. Dates in ISO format (YYYY-MM-DD). Source: Versio.io product release & end-of-life database.
The entire lifecycle of the product zOS
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Facts and figures about zOS
| Product | zOS |
|---|---|
| Vendor | IBM |
| Latest version | 3.2.0 |
| Number of releases | 20 |
| Number of versions | 20 |
| Number of unstable versions | 0 |
| Number of versions affected by CVE | 0 |
| Licence | Commercial |
| Wikipedia | https://en.wikipedia.org/wiki/Z/OS |
Frequently asked questions about IBM zOS end of life
What is the latest version of IBM zOS?
The latest version of IBM zOS is 3.2.0, released as part of the 3.2 release on 30 September 2025.
Which IBM zOS versions are still supported?
zOS 3.2 is supported as of 11 October 2026. All other releases have reached end of life and no longer receive fixes.
Does IBM zOS have long-term support (LTS) releases?
No. IBM zOS does not designate long-term support releases; every release follows the standard maintenance period shown in the table.
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