diff --git a/trezorlib/messages/StellarCreateAccountOp.py b/trezorlib/messages/StellarCreateAccountOp.py
index e1fee62db..4c5d22a43 100644
--- a/trezorlib/messages/StellarCreateAccountOp.py
+++ b/trezorlib/messages/StellarCreateAccountOp.py
@@ -6,6 +6,6 @@ class StellarCreateAccountOp(p.MessageType):
     FIELDS = {
         1: ('source_account', p.BytesType, 0),
         2: ('new_account', p.BytesType, 0),
-        3: ('starting_balance', p.Sint64Type, 0),
+        3: ('starting_balance', p.SVarintType, 0),
     }
     MESSAGE_WIRE_TYPE = 210
diff --git a/trezorlib/messages/StellarCreatePassiveOfferOp.py b/trezorlib/messages/StellarCreatePassiveOfferOp.py
index b84ab0662..e18210e8b 100644
--- a/trezorlib/messages/StellarCreatePassiveOfferOp.py
+++ b/trezorlib/messages/StellarCreatePassiveOfferOp.py
@@ -8,7 +8,7 @@ class StellarCreatePassiveOfferOp(p.MessageType):
         1: ('source_account', p.BytesType, 0),
         2: ('selling_asset', StellarAssetType, 0),
         3: ('buying_asset', StellarAssetType, 0),
-        4: ('amount', p.Sint64Type, 0),
+        4: ('amount', p.SVarintType, 0),
         5: ('price_n', p.UVarintType, 0),
         6: ('price_d', p.UVarintType, 0),
     }
diff --git a/trezorlib/messages/StellarManageOfferOp.py b/trezorlib/messages/StellarManageOfferOp.py
index 8a77ad441..70564f151 100644
--- a/trezorlib/messages/StellarManageOfferOp.py
+++ b/trezorlib/messages/StellarManageOfferOp.py
@@ -8,7 +8,7 @@ class StellarManageOfferOp(p.MessageType):
         1: ('source_account', p.BytesType, 0),
         2: ('selling_asset', StellarAssetType, 0),
         3: ('buying_asset', StellarAssetType, 0),
-        4: ('amount', p.Sint64Type, 0),
+        4: ('amount', p.SVarintType, 0),
         5: ('price_n', p.UVarintType, 0),
         6: ('price_d', p.UVarintType, 0),
         7: ('offer_id', p.UVarintType, 0),
diff --git a/trezorlib/messages/StellarPathPaymentOp.py b/trezorlib/messages/StellarPathPaymentOp.py
index 906bf3499..491d5b723 100644
--- a/trezorlib/messages/StellarPathPaymentOp.py
+++ b/trezorlib/messages/StellarPathPaymentOp.py
@@ -7,10 +7,10 @@ class StellarPathPaymentOp(p.MessageType):
     FIELDS = {
         1: ('source_account', p.BytesType, 0),
         2: ('send_asset', StellarAssetType, 0),
-        3: ('send_max', p.Sint64Type, 0),
+        3: ('send_max', p.SVarintType, 0),
         4: ('destination_account', p.BytesType, 0),
         5: ('destination_asset', StellarAssetType, 0),
-        6: ('destination_amount', p.Sint64Type, 0),
+        6: ('destination_amount', p.SVarintType, 0),
         7: ('paths', StellarAssetType, p.FLAG_REPEATED),
     }
     MESSAGE_WIRE_TYPE = 212
diff --git a/trezorlib/messages/StellarPaymentOp.py b/trezorlib/messages/StellarPaymentOp.py
index ca15f51a9..23d5be5bc 100644
--- a/trezorlib/messages/StellarPaymentOp.py
+++ b/trezorlib/messages/StellarPaymentOp.py
@@ -8,6 +8,6 @@ class StellarPaymentOp(p.MessageType):
         1: ('source_account', p.BytesType, 0),
         2: ('destination_account', p.BytesType, 0),
         3: ('asset', StellarAssetType, 0),
-        4: ('amount', p.Sint64Type, 0),
+        4: ('amount', p.SVarintType, 0),
     }
     MESSAGE_WIRE_TYPE = 211
diff --git a/vendor/trezor-common b/vendor/trezor-common
index 9abe3a7c6..44dfb07cf 160000
--- a/vendor/trezor-common
+++ b/vendor/trezor-common
@@ -1 +1 @@
-Subproject commit 9abe3a7c69000cc7ee3cda2ec940193fa9d62e6c
+Subproject commit 44dfb07cfaafffada4b2ce0d15ba1d90d17cf35e