Note: Major releases are announced via the slepc-announce mailing list, while patch releases are announced via the RSS news feed (use the "subscribe" button in the front webpage).

SLEPc Release Version 3.21

The following downloads correspond to the latest available release. Note that slepc4py source (without documentation) is already included in the SLEPc tarball.

Description File MD5 checksum
SLEPc distribution file (source code only) slepc-3.21.1.tar.gz fadaf58d9b2f8aa53eb30e745bf59ed7
SLEPc distribution file (source code with documentation) slepc-with-docs-3.21.1.tar.gz cb2bece8a0bea86e57631aaffad4caf1
slepc4py distribution file (enables separate install) slepc4py-3.21.1.tar.gz 1e6bbc2c201afcb49e3bd5276bf6aae0

There are no separate patch files, the current fixes are included in the tar file. Patches are documented at: slepc-3.21 change log

Previous Versions

Distribution files: [3.0.0] [3.1] [3.2] [3.3] [3.4] [3.5] [3.6] [3.7] [3.8] [3.9] [3.10] [3.11] [3.12] [3.13] [3.14] [3.15] [3.16] [3.17] [3.18] [3.19] [3.20]

Note: Users of previous versions are strongly recommended to upgrade to the latest one.
Note: Even older releases can be found here.

Development Version

The development repository is hosted at and uses the git version control system. Note that using the development version requires also a development version of PETSc.

The development process follows the methodology used by PETSc, with two integration branches (main and release), together with various feature branches. One can expect SLEPc's main branch to be synchronized with PETSc's main branch.

In order to get the development version of SLEPc, you need to clone the repository:

$ git clone

At a later time, the repository can be refreshed simply by:

$ git pull

You can also use the repository to work with the release version, instead of downloading the tarball file. The release branch tracks the latest release version, including all the patches. It is also possible to check out a specific version with the tag name, for instance:

$ git checkout v3.21.0

The source code in the repository can be browsed at Some statistics related to source code development can be found at

Additional information can be found at PETSc Developer’s Documentation.

Users of the development version may also want to check the nightly tests for various builds of SLEPc's main branch with PETSc's main branch, as well as the source coverage of these tests (for real or complex). The development copy of the documentation is also available, also for the python interface (slepc4py docs).