https://github.com/pahaz/sshtunnel/issues/302
https://github.com/pahaz/sshtunnel/pull/300

From 7030d0c76c679c2934bdc27adc48ff5a84d1ae9a Mon Sep 17 00:00:00 2001
From: lglines <lglines@fleetio.com>
Date: Mon, 4 Aug 2025 08:58:11 -0600
Subject: [PATCH] remove DSSKey, which is no longer supported by paramiko

--- a/sshtunnel.py
+++ b/sshtunnel.py
@@ -1090,7 +1090,6 @@ def get_keys(logger=None, host_pkey_directories=None, allow_agent=False):
             host_pkey_directories = [DEFAULT_SSH_DIRECTORY]
 
         paramiko_key_types = {'rsa': paramiko.RSAKey,
-                              'dsa': paramiko.DSSKey,
                               'ecdsa': paramiko.ECDSAKey}
         if hasattr(paramiko, 'Ed25519Key'):
             # NOQA: new in paramiko>=2.2: http://docs.paramiko.org/en/stable/api/keys.html#module-paramiko.ed25519key
@@ -1295,7 +1294,7 @@ def read_private_key_file(pkey_file,
             paramiko.Pkey
         """
         ssh_pkey = None
-        key_types = (paramiko.RSAKey, paramiko.DSSKey, paramiko.ECDSAKey)
+        key_types = (paramiko.RSAKey, paramiko.ECDSAKey)
         if hasattr(paramiko, 'Ed25519Key'):
             # NOQA: new in paramiko>=2.2: http://docs.paramiko.org/en/stable/api/keys.html#module-paramiko.ed25519key
             key_types += (paramiko.Ed25519Key, )