Removed support for the DSA (aka DSS) key algorithm, as it has been badly outdated and insecure for a decade or more at this point, and was recently completely removed from OpenSSH as well.

If you were still using DSA out of sheer inertia: we strongly recommend upgrading to Ed25519 (or maybe ECDSA).

If you were still using DSA because of target hosts you do not control: please continue using Paramiko 3.x.

Links

• Changelog: https://www.paramiko.org/changelog.html#4.0.0

Blockers

• Remove support for DSA (aka DSS) key algorithm pahaz/sshtunnel#299