diff --git a/embed/extmod/modtrezorcrypto/modtrezorcrypto-bip32.h b/embed/extmod/modtrezorcrypto/modtrezorcrypto-bip32.h
index 5ccb08868f..663f0e441b 100644
--- a/embed/extmod/modtrezorcrypto/modtrezorcrypto-bip32.h
+++ b/embed/extmod/modtrezorcrypto/modtrezorcrypto-bip32.h
@@ -519,11 +519,12 @@ STATIC mp_obj_t mod_trezorcrypto_bip32_from_mnemonic_cardano(mp_obj_t mnemonic)
         mp_raise_ValueError("Invalid mnemonic");
     }
 
-    int res = hdnode_from_seed_cardano((const uint8_t *)"", 0, entropy, entropy_len / 8, &hdnode);
+    const int res = hdnode_from_seed_cardano((const uint8_t *)"", 0, entropy, entropy_len / 8, &hdnode);
 
     if (!res) {
         mp_raise_ValueError("Secret key generation from mnemonic is looping forever");
-    }else if(res == -1){
+    } else
+    if (res == -1) {
         mp_raise_ValueError("Invalid mnemonic");
     }
 
diff --git a/src/apps/cardano/get_public_key.py b/src/apps/cardano/get_public_key.py
index c7a6a6d75d..813e0ac852 100644
--- a/src/apps/cardano/get_public_key.py
+++ b/src/apps/cardano/get_public_key.py
@@ -35,9 +35,6 @@ def _get_public_key(root_node, derivation_path: list):
     chain_code = hexlify(node.chain_code()).decode()
     xpub_key = public_key + chain_code
 
-    # In derivation scheme v2 the passphrase is not used
-    root_hd_passphrase = None
-
     node_type = HDNodeType(
         depth=node.depth(),
         child_num=node.child_num(),
@@ -46,6 +43,4 @@ def _get_public_key(root_node, derivation_path: list):
         public_key=seed.remove_ed25519_prefix(node.public_key()),
     )
 
-    return CardanoPublicKey(
-        node=node_type, xpub=xpub_key, root_hd_passphrase=root_hd_passphrase
-    )
+    return CardanoPublicKey(node=node_type, xpub=xpub_key)
diff --git a/src/apps/cardano/sign_tx.py b/src/apps/cardano/sign_tx.py
index 219e77d0b3..c0abebd59e 100644
--- a/src/apps/cardano/sign_tx.py
+++ b/src/apps/cardano/sign_tx.py
@@ -116,7 +116,7 @@ async def sign_tx(ctx, msg):
         transaction.change_coins,
         transaction.fee,
         len(tx_body),
-        transaction.network.get("name"),
+        transaction.network_name,
     ):
         raise wire.ActionCancelled("Signing cancelled")
 
@@ -129,32 +129,22 @@ def _micro_ada_to_ada(amount: float) -> float:
 
 class Transaction:
     def __init__(
-        self, inputs: list, outputs: list, transactions: list, root_node, network
+        self, inputs: list, outputs: list, transactions: list, root_node, network: int
     ):
         self.inputs = inputs
         self.outputs = outputs
         self.transactions = transactions
         self.root_node = root_node
-        self.network = None
-
-        self._set_network(network)
-
         # attributes have to be always empty in current Cardano
         self.attributes = {}
-
-    def _set_network(self, network):
         if network == 1:
-            self.network = {
-                "name": "Testnet",
-                "magic_prefix": b"\x01\x1a\x41\x70\xcb\x17\x58\x20",
-            }
+            self.network_name = "Testnet"
+            self.network_magic = b"\x01\x1a\x41\x70\xcb\x17\x58\x20"
         elif network == 2:
-            self.network = {
-                "name": "Mainnet",
-                "magic_prefix": b"\x01\x1a\x2d\x96\x4a\x09\x58\x20",
-            }
+            self.network_name = "Mainnet"
+            self.network_magic = b"\x01\x1a\x2d\x96\x4a\x09\x58\x20"
         else:
-            raise wire.ProcessError("Unknown network index " + str(network))
+            raise wire.ProcessError("Unknown network index %d" % network)
 
     def _process_inputs(self):
         input_coins = []
@@ -224,7 +214,7 @@ class Transaction:
     def _build_witnesses(self, tx_aux_hash: str):
         witnesses = []
         for index, node in enumerate(self.nodes):
-            message = self.network.get("magic_prefix") + tx_aux_hash
+            message = self.network_magic + tx_aux_hash
             signature = ed25519.sign_ext(
                 node.private_key(), node.private_key_ext(), message
             )
diff --git a/src/trezor/messages/CardanoPublicKey.py b/src/trezor/messages/CardanoPublicKey.py
index ddacc256b0..f73717c32f 100644
--- a/src/trezor/messages/CardanoPublicKey.py
+++ b/src/trezor/messages/CardanoPublicKey.py
@@ -10,15 +10,12 @@ class CardanoPublicKey(p.MessageType):
     FIELDS = {
         1: ('xpub', p.UnicodeType, 0),
         2: ('node', HDNodeType, 0),
-        3: ('root_hd_passphrase', p.UnicodeType, 0),
     }
 
     def __init__(
         self,
         xpub: str = None,
         node: HDNodeType = None,
-        root_hd_passphrase: str = None,
     ) -> None:
         self.xpub = xpub
         self.node = node
-        self.root_hd_passphrase = root_hd_passphrase
diff --git a/tests/test_apps.cardano.get_public_key.py b/tests/test_apps.cardano.get_public_key.py
index fa1aa4ac13..4021688d11 100644
--- a/tests/test_apps.cardano.get_public_key.py
+++ b/tests/test_apps.cardano.get_public_key.py
@@ -17,20 +17,18 @@ class TestCardanoGetPublicKey(unittest.TestCase):
             [0x80000000 | 44, 0x80000000 | 1815, 0x80000000, 0, 0],
         ]
 
-        root_hd_passphrase = None
-
         public_keys = [
-            'a938c8554ae04616cfaae7cd0eb557475082c4e910242ce774967e0bd7492408',
-            '8c47ebce34234d04fd3dfbac33feaba6133e4e3d77c4b5ab18120ec6878ad4ce',
-            '17cc0bf978756d0d5c76f931629036a810c61801b78beecb44555773d13e3791',
-            'b90fb812a2268e9569ff1172e8daed1da3dc7e72c7bded7c5bcb7282039f90d5',
+            b'a938c8554ae04616cfaae7cd0eb557475082c4e910242ce774967e0bd7492408',
+            b'8c47ebce34234d04fd3dfbac33feaba6133e4e3d77c4b5ab18120ec6878ad4ce',
+            b'17cc0bf978756d0d5c76f931629036a810c61801b78beecb44555773d13e3791',
+            b'b90fb812a2268e9569ff1172e8daed1da3dc7e72c7bded7c5bcb7282039f90d5',
         ]
 
         chain_codes = [
-            'cbf6ab47c8eb1a0477fc40b25dbb6c4a99454edb97d6fe5acedd3e238ef46fe0',
-            '02ac67c59a8b0264724a635774ca2c242afa10d7ab70e2bf0a8f7d4bb10f1f7a',
-            '646ac4a6295326bae6831be05921edfbcb362de48dfd37b12e74c227dfad768d',
-            'fd8e71c1543de2cdc7f7623130c5f2cceb53549055fa1f5bc88199989e08cce7',
+            b'cbf6ab47c8eb1a0477fc40b25dbb6c4a99454edb97d6fe5acedd3e238ef46fe0',
+            b'02ac67c59a8b0264724a635774ca2c242afa10d7ab70e2bf0a8f7d4bb10f1f7a',
+            b'646ac4a6295326bae6831be05921edfbcb362de48dfd37b12e74c227dfad768d',
+            b'fd8e71c1543de2cdc7f7623130c5f2cceb53549055fa1f5bc88199989e08cce7',
         ]
 
         xpub_keys = [
@@ -43,10 +41,9 @@ class TestCardanoGetPublicKey(unittest.TestCase):
         for index, derivation_path in enumerate(derivation_paths):
             key = _get_public_key(node, derivation_path)
 
-            self.assertEqual(hexlify(key.node.public_key).decode('utf8'), public_keys[index])
-            self.assertEqual(hexlify(key.node.chain_code).decode('utf8'), chain_codes[index])
+            self.assertEqual(hexlify(key.node.public_key), public_keys[index])
+            self.assertEqual(hexlify(key.node.chain_code), chain_codes[index])
             self.assertEqual(key.xpub, xpub_keys[index])
-            self.assertEqual(key.root_hd_passphrase, root_hd_passphrase)
 
 
 if __name__ == '__main__':
diff --git a/vendor/trezor-common b/vendor/trezor-common
index ab58324dc0..4e7df217d3 160000
--- a/vendor/trezor-common
+++ b/vendor/trezor-common
@@ -1 +1 @@
-Subproject commit ab58324dc034328dc00cd14691d6bb86fe8ecec5
+Subproject commit 4e7df217d337c8800fc91bac61038918bf3773e4