diff --git a/trezorlib/btc.py b/trezorlib/btc.py
index 3d43c415d..250a04b22 100644
--- a/trezorlib/btc.py
+++ b/trezorlib/btc.py
@@ -90,6 +90,7 @@ def sign_tx(
     lock_time=None,
     expiry=None,
     overwintered=None,
+    version_group_id=None,
     debug_processor=None,
 ):
     # start = time.time()
@@ -108,6 +109,8 @@ def sign_tx(
         tx.expiry = expiry
     if overwintered is not None:
         tx.overwintered = overwintered
+    if version_group_id is not None:
+        tx.version_group_id = version_group_id
     res = client.call(tx)
 
     # Prepare structure for signatures
diff --git a/trezorlib/tests/device_tests/test_msg_signtx_zcash.py b/trezorlib/tests/device_tests/test_msg_signtx_zcash.py
index 88d95ca17..66e4c6514 100644
--- a/trezorlib/tests/device_tests/test_msg_signtx_zcash.py
+++ b/trezorlib/tests/device_tests/test_msg_signtx_zcash.py
@@ -84,6 +84,7 @@ class TestMsgSigntxZcash(TrezorTest):
                 [out1],
                 version=3,
                 overwintered=True,
+                version_group_id=0x3C48270,
             )
 
         # Accepted by network: tx eda9b772c47f0c29310759960e0081c98707aa67a0a2738bcc71439fcf360675
diff --git a/trezorlib/tx_api.py b/trezorlib/tx_api.py
index 1ef5b45da..6e6020540 100644
--- a/trezorlib/tx_api.py
+++ b/trezorlib/tx_api.py
@@ -97,6 +97,11 @@ class TxApiInsight(TxApi):
         if self.decred:
             t.expiry = data["expiry"]
 
+        if self.zcash:
+            t.overwintered = data.get("fOverwintered", False)
+            t.expiry = data.get("nExpiryHeight", None)
+            t.version_group_id = data.get("nVersionGroupId", None)
+
         for vin in data["vin"]:
             i = t._add_inputs()
             if "coinbase" in vin.keys():
@@ -131,8 +136,6 @@ class TxApiInsight(TxApi):
                 o.decred_script_version = vout["version"]
 
         if self.zcash:
-            t.overwintered = data.get("fOverwintered", False)
-            t.expiry = data.get("nExpiryHeight", False)
             if t.version >= 2:
                 joinsplit_cnt = len(data["vjoinsplit"])
                 if joinsplit_cnt == 0:
diff --git a/vendor/trezor-common b/vendor/trezor-common
index 41e4a84b5..95ffa894c 160000
--- a/vendor/trezor-common
+++ b/vendor/trezor-common
@@ -1 +1 @@
-Subproject commit 41e4a84b5b01d03e980f84fab29c8f0b0ec948f5
+Subproject commit 95ffa894c8808dd9a66cd6c88f434a241a43de91