diff --git a/python/src/trezorlib/debuglink.py b/python/src/trezorlib/debuglink.py
index 27c65d40de..aec80f8d2b 100644
--- a/python/src/trezorlib/debuglink.py
+++ b/python/src/trezorlib/debuglink.py
@@ -1163,6 +1163,7 @@ class SessionDebugWrapper(Session):
         self.button_callback = self.client.button_callback
         self.pin_callback = self.client.pin_callback
         self.passphrase_callback = self._session.passphrase_callback
+        self.passphrase = self._session.passphrase
 
     def __enter__(self) -> "SessionDebugWrapper":
         # For usage in with/expected_responses
diff --git a/python/src/trezorlib/transport/session.py b/python/src/trezorlib/transport/session.py
index 626080f271..a5d8ada5e4 100644
--- a/python/src/trezorlib/transport/session.py
+++ b/python/src/trezorlib/transport/session.py
@@ -96,7 +96,7 @@ class Session:
 class SessionV1(Session):
     @classmethod
     def new(
-        cls, client: TrezorClient, passphrase: str | None, derive_cardano: bool
+        cls, client: TrezorClient, passphrase: str = "", derive_cardano: bool = False
     ) -> SessionV1:
         assert isinstance(client.protocol, ProtocolV1)
         session_id = client.features.session_id
@@ -108,6 +108,7 @@ class SessionV1(Session):
         session.button_callback = client.button_callback
         session.pin_callback = client.pin_callback
         session.passphrase_callback = _callback_passphrase
+        session.passphrase = passphrase
         session._init_session(derive_cardano=derive_cardano)
         return session
 
@@ -132,7 +133,7 @@ def _callback_button(session: Session, msg: t.Any) -> t.Any:
 
 
 def _callback_passphrase(session: Session, msg: messages.PassphraseRequest) -> t.Any:
-    available_on_device = Capability.PassphraseEntry in Session.features.capabilities
+    available_on_device = Capability.PassphraseEntry in session.features.capabilities
     def send_passphrase(
         passphrase: str | None = None, on_device: bool | None = None
     ) -> t.Any:
diff --git a/tests/device_tests/cardano/test_address_public_key.py b/tests/device_tests/cardano/test_address_public_key.py
index 95f42ecec1..d8ec9288eb 100644
--- a/tests/device_tests/cardano/test_address_public_key.py
+++ b/tests/device_tests/cardano/test_address_public_key.py
@@ -96,7 +96,7 @@ def test_cardano_get_address(session: Session, chunkify: bool, parameters, resul
 )
 def test_cardano_get_public_key(session: Session, parameters, result):
     with session, session.client as client:
-        IF = InputFlowShowXpubQRCode(client, passphrase=False)
+        IF = InputFlowShowXpubQRCode(client, passphrase=bool(session.passphrase))
         client.set_input_flow(IF.get())
         # session.init_device(new_session=True, derive_cardano=True)