diff --git a/src/apps/wallet/sign_tx/helpers.py b/src/apps/wallet/sign_tx/helpers.py
index 62ce1e855e..0611acf780 100644
--- a/src/apps/wallet/sign_tx/helpers.py
+++ b/src/apps/wallet/sign_tx/helpers.py
@@ -105,6 +105,8 @@ def sanitize_sign_tx(tx: SignTx) -> SignTx:
     tx.inputs_count = tx.inputs_count if tx.inputs_count is not None else 0
     tx.outputs_count = tx.outputs_count if tx.outputs_count is not None else 0
     tx.coin_name = tx.coin_name if tx.coin_name is not None else 'Bitcoin'
+    tx.decred_expiry = tx.decred_expiry if tx.decred_expiry is not None else 0
+    tx.overwintered = tx.overwintered if tx.overwintered is not None else False
     return tx
 
 
@@ -114,6 +116,8 @@ def sanitize_tx_meta(tx: TransactionType) -> TransactionType:
     tx.inputs_cnt = tx.inputs_cnt if tx.inputs_cnt is not None else 0
     tx.outputs_cnt = tx.outputs_cnt if tx.outputs_cnt is not None else 0
     tx.extra_data_len = tx.extra_data_len if tx.extra_data_len is not None else 0
+    tx.decred_expiry = tx.decred_expiry if tx.decred_expiry is not None else 0
+    tx.overwintered = tx.overwintered if tx.overwintered is not None else False
     return tx
 
 
diff --git a/src/trezor/messages/SignTx.py b/src/trezor/messages/SignTx.py
index 6c91c19a12..9c6c787242 100644
--- a/src/trezor/messages/SignTx.py
+++ b/src/trezor/messages/SignTx.py
@@ -11,6 +11,7 @@ class SignTx(p.MessageType):
         4: ('version', p.UVarintType, 0),  # default=1
         5: ('lock_time', p.UVarintType, 0),  # default=0
         6: ('decred_expiry', p.UVarintType, 0),
+        7: ('overwintered', p.BoolType, 0),
     }
 
     def __init__(
@@ -20,7 +21,8 @@ class SignTx(p.MessageType):
         coin_name: str = None,
         version: int = None,
         lock_time: int = None,
-        decred_expiry: int = None
+        decred_expiry: int = None,
+        overwintered: bool = None
     ) -> None:
         self.outputs_count = outputs_count
         self.inputs_count = inputs_count
@@ -28,3 +30,4 @@ class SignTx(p.MessageType):
         self.version = version
         self.lock_time = lock_time
         self.decred_expiry = decred_expiry
+        self.overwintered = overwintered
diff --git a/src/trezor/messages/SimpleSignTx.py b/src/trezor/messages/SimpleSignTx.py
index 7f2a27a6a1..741a914343 100644
--- a/src/trezor/messages/SimpleSignTx.py
+++ b/src/trezor/messages/SimpleSignTx.py
@@ -19,6 +19,8 @@ class SimpleSignTx(p.MessageType):
         4: ('coin_name', p.UnicodeType, 0),  # default='Bitcoin'
         5: ('version', p.UVarintType, 0),  # default=1
         6: ('lock_time', p.UVarintType, 0),  # default=0
+        7: ('decred_expiry', p.UVarintType, 0),
+        8: ('overwintered', p.BoolType, 0),
     }
 
     def __init__(
@@ -28,7 +30,9 @@ class SimpleSignTx(p.MessageType):
         transactions: List[TransactionType] = None,
         coin_name: str = None,
         version: int = None,
-        lock_time: int = None
+        lock_time: int = None,
+        decred_expiry: int = None,
+        overwintered: bool = None
     ) -> None:
         self.inputs = inputs if inputs is not None else []
         self.outputs = outputs if outputs is not None else []
@@ -36,3 +40,5 @@ class SimpleSignTx(p.MessageType):
         self.coin_name = coin_name
         self.version = version
         self.lock_time = lock_time
+        self.decred_expiry = decred_expiry
+        self.overwintered = overwintered
diff --git a/vendor/trezor-common b/vendor/trezor-common
index 5520e98f4a..0f7118bb3d 160000
--- a/vendor/trezor-common
+++ b/vendor/trezor-common
@@ -1 +1 @@
-Subproject commit 5520e98f4ab3ffb3ca347b1bfe417c5a380b9cbf
+Subproject commit 0f7118bb3d27c3c51a89c776c1b083db91f50541