Index: paramiko-3.4.0/tests/test_transport.py
===================================================================
--- paramiko-3.4.0.orig/tests/test_transport.py
+++ paramiko-3.4.0/tests/test_transport.py
@@ -1423,12 +1423,12 @@ class TestStrictKex:
                 setattr(
                     self.packetizer,
                     "_Packetizer__sequence_number_in",
-                    sys.maxsize,
+                    2**63-1,
                 )
                 setattr(
                     self.packetizer,
                     "_Packetizer__sequence_number_out",
-                    sys.maxsize,
+                    2**63-1,
                 )
 
         with raises(