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# Changes for each release
We will continually add new features and enhanced functionality in
upcoming releases; **small changes in usage and calling sequences of
PETSc routines will continue to occur**. We use the C/C++ deprecation
feature (which prints deprecation warnings) to allow users to continue
to use older interfaces until they update their codes. Although keeping one's code
accordingly up-to-date can be annoying, all PETSc users will be
rewarded in the long run with a cleaner, better designed, and
easier-to-use interface.
We suggest that users who want to upgrade their current PETSc
application codes from a particular version to the most recent
release proceed through the changes listed in this file in increasing
order of version numbers. (Note: One can determine the release number
of any current PETSc installation by looking in the file
include/petscversion.h) Many of the interface changes can be handled
quickly and easily by using global replacement via your favorite text
editor.
```{toctree}
:maxdepth: 1
3.23 - Public Release, Mar 28, 2025 <323>
3.22 - Public Release, Sep 28, 2024 <322>
3.21 - Public Release, Mar 29, 2024 <321>
3.20 - Public Release, Sep 28, 2023 <320>
3.19 - Public Release, Mar 30, 2023 <319>
3.18 - Public Release, Sep 30, 2022 <318>
3.17 - Public Release, Mar 30, 2022 <317>
3.16 - Public Release, Sep 29, 2021 <316>
3.15 - Public Release, Mar 30, 2021 <315>
3.14 - Public Release, Sep 29, 2020 <314>
3.13 - Public Release, Mar 30, 2020 <313>
3.12 - Public Release, Sep 29, 2019 <312>
3.11 - Public Release, Mar 29, 2019 <311>
3.10 - Public Release, Sep 12, 2018 <310>
3.9 - Public Release, Apr 7, 2018 <39>
3.8 - Public Release, Sep 26, 2017 <38>
3.7 - Public Release, Apr 25, 2016 <37>
3.6 - Public Release, Jun 9, 2015 <36>
3.5 - Public Release, Jun 30, 2014 <35>
3.4 - Public Release, May 13, 2013 <34>
3.3 - Public Release, Jun 5, 2012 <33>
3.2 - Public Release, Sep 8, 2011 <32>
3.1 - Public release, Mar 25, 2010 <31>
3.0.0 - Public release, Dec 19, 2008 <300>
2.3.3 - Public release, May 23, 2007 <233>
2.3.2 - Public release, Sep 1, 2006 <232>
2.3.1 - Public release, Feb, 3, 2006 <231>
2.3.0 - Public release, Apr, 26, 2005 <230>
2.2.1 - Public release, Aug, 18 2004 <221>
2.2.0 - Public release, Feb 27, 2004 <220>
2.1.6 - Public release, Aug 5, 2003 <216>
2.1.5 - Public release, Jan 27, 2003 <215>
2.1.4 - private - Microsoft Cluster Software CD <214>
2.1.3 - Public release, May 31, 2002 <213>
2.1.2 - public release, April 22 , 2002 <212>
2.1.1 - public release, December 19, 2001 <211>
2.1.0 - public release, April 11, 2001 <21>
2.0.29 - public release, September 26, 2000 <2029>
2.0.28 - public release, March 27, 2000 <2028>
2.0.25, 2.0.26, 2.0.27 - private releases <2025_through_2027>
2.0.24 - public release, April 6, 1999 <2024>
2.0.23 - private release, September 29,1998 <2023>
2.0.22 - public release, April 29, 1998 <2022>
2.0.21 - public release, November 13, 1997 <2021>
2.0.18, 2.0.19, 2.0.20 - private releases <2018_through_2020>
2.0.17 - public release, April 5, 1997 <2017>
2.0.16 - private release, December 10, 1996 for "Bring Your Own Code" Workshop participants <2016>
2.0.15 - public release, October 4, 1996 <2015>
2.0.13 - public release, April 18, 1996 <2013>
2.0.Beta.10 - public release, December 15, 1995 <20beta10>
2.0.Beta.8 - public release, October 13, 1995 <20beta8>
2.0.Beta.6 - public release, July 30, 1995 <20beta6>
2.0.Beta.4 - public release, June 21, 1995 <20beta4>
```
We announce new PETSc releases on the
{doc}`petsc-announce mailing list </community/mailing>`.
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