diff --git a/common/defs/bitcoin/groestlcoin.json b/common/defs/bitcoin/groestlcoin.json
index d436d24acb..19cad0893d 100644
--- a/common/defs/bitcoin/groestlcoin.json
+++ b/common/defs/bitcoin/groestlcoin.json
@@ -23,7 +23,7 @@
   "cashaddr_prefix": null,
   "slip44": 17,
   "segwit": true,
-  "taproot": false,
+  "taproot": true,
   "decred": false,
   "fork_id": null,
   "force_bip143": false,
diff --git a/common/defs/bitcoin/groestlcoin_testnet.json b/common/defs/bitcoin/groestlcoin_testnet.json
index 0cb3ecb5ad..ce600b3c43 100644
--- a/common/defs/bitcoin/groestlcoin_testnet.json
+++ b/common/defs/bitcoin/groestlcoin_testnet.json
@@ -23,7 +23,7 @@
   "cashaddr_prefix": null,
   "slip44": 1,
   "segwit": true,
-  "taproot": false,
+  "taproot": true,
   "decred": false,
   "fork_id": null,
   "force_bip143": false,
diff --git a/core/src/apps/common/coininfo.py b/core/src/apps/common/coininfo.py
index 8457cbf4f2..5c2157f8c6 100644
--- a/core/src/apps/common/coininfo.py
+++ b/core/src/apps/common/coininfo.py
@@ -868,7 +868,7 @@ def by_name(name: str) -> CoinInfo:
                 cashaddr_prefix=None,
                 slip44=17,
                 segwit=True,
-                taproot=False,
+                taproot=True,
                 fork_id=None,
                 force_bip143=False,
                 decred=False,
@@ -897,7 +897,7 @@ def by_name(name: str) -> CoinInfo:
                 cashaddr_prefix=None,
                 slip44=1,
                 segwit=True,
-                taproot=False,
+                taproot=True,
                 fork_id=None,
                 force_bip143=False,
                 decred=False,
diff --git a/tests/device_tests/bitcoin/test_getaddress.py b/tests/device_tests/bitcoin/test_getaddress.py
index dc1b981eda..231635b9e7 100644
--- a/tests/device_tests/bitcoin/test_getaddress.py
+++ b/tests/device_tests/bitcoin/test_getaddress.py
@@ -111,6 +111,22 @@ def test_grs(client):
     )
 
 
+@pytest.mark.altcoin
+def test_tgrs(client):
+    assert (
+        btc.get_address(client, "Groestlcoin Testnet", parse_path("44'/1'/0'/0/0"))
+        == "mvbu1Gdy8SUjTenqerxUaZyYjmvedc787y"
+    )
+    assert (
+        btc.get_address(client, "Groestlcoin Testnet", parse_path("44'/1'/0'/1/0"))
+        == "mm6kLYbGEL1tGe4ZA8xacfgRPdW1LMq8cN"
+    )
+    assert (
+        btc.get_address(client, "Groestlcoin Testnet", parse_path("44'/1'/0'/1/1"))
+        == "mjXZwmEi1z1MzveZrKUAo4DBgbdq6ZhGD6"
+    )
+
+
 @pytest.mark.altcoin
 def test_elements(client):
     assert (
diff --git a/tests/device_tests/bitcoin/test_getaddress_segwit.py b/tests/device_tests/bitcoin/test_getaddress_segwit.py
index 7e51d4b773..0e0a4db54c 100644
--- a/tests/device_tests/bitcoin/test_getaddress_segwit.py
+++ b/tests/device_tests/bitcoin/test_getaddress_segwit.py
@@ -70,6 +70,17 @@ def test_show_segwit(client):
 
 @pytest.mark.altcoin
 def test_show_segwit_altcoin(client):
+    assert (
+        btc.get_address(
+            client,
+            "Groestlcoin Testnet",
+            parse_path("49'/1'/0'/1/0"),
+            True,
+            None,
+            script_type=messages.InputScriptType.SPENDP2SHWITNESS,
+        )
+        == "2N1LGaGg836mqSQqiuUBLfcyGBhyZYBtBZ7"
+    )
     assert (
         btc.get_address(
             client,
@@ -81,6 +92,28 @@ def test_show_segwit_altcoin(client):
         )
         == "2N4Q5FhU2497BryFfUgbqkAJE87aKDv3V3e"
     )
+    assert (
+        btc.get_address(
+            client,
+            "Groestlcoin Testnet",
+            parse_path("44'/1'/0'/0/0"),
+            False,
+            None,
+            script_type=messages.InputScriptType.SPENDP2SHWITNESS,
+        )
+        == "2N6UeBoqYEEnybg4cReFYDammpsyDzLXvCT"
+    )
+    assert (
+        btc.get_address(
+            client,
+            "Groestlcoin Testnet",
+            parse_path("44'/1'/0'/0/0"),
+            False,
+            None,
+            script_type=messages.InputScriptType.SPENDADDRESS,
+        )
+        == "mvbu1Gdy8SUjTenqerxUaZyYjmvedc787y"
+    )
     assert (
         btc.get_address(
             client,
diff --git a/tests/device_tests/bitcoin/test_getaddress_segwit_native.py b/tests/device_tests/bitcoin/test_getaddress_segwit_native.py
index a2bc2a5f10..3805ded31e 100644
--- a/tests/device_tests/bitcoin/test_getaddress_segwit_native.py
+++ b/tests/device_tests/bitcoin/test_getaddress_segwit_native.py
@@ -69,6 +69,20 @@ VECTORS = (  # coin, path, script_type, address
         messages.InputScriptType.SPENDTAPROOT,
         "bc1pgypgja2hmcx2l6s2ssq75k6ev68ved6nujcspt47dgvkp8euc70s6uegk6",
     ),
+    pytest.param(
+        "Groestlcoin Testnet",
+        "84'/1'/0'/0/0",
+        messages.InputScriptType.SPENDWITNESS,
+        "tgrs1qkvwu9g3k2pdxewfqr7syz89r3gj557l3ued7ja",
+        marks=pytest.mark.altcoin,
+    ),
+    pytest.param(
+        "Groestlcoin Testnet",
+        "84'/1'/0'/1/0",
+        messages.InputScriptType.SPENDWITNESS,
+        "tgrs1qejqxwzfld7zr6mf7ygqy5s5se5xq7vmt9lkd57",
+        marks=pytest.mark.altcoin,
+    ),
     pytest.param(
         "Groestlcoin",
         "84'/17'/0'/0/0",
@@ -76,6 +90,27 @@ VECTORS = (  # coin, path, script_type, address
         "grs1qw4teyraux2s77nhjdwh9ar8rl9dt7zww8r6lne",
         marks=pytest.mark.altcoin,
     ),
+    pytest.param(
+        "Groestlcoin",
+        "84'/17'/0'/1/0",
+        messages.InputScriptType.SPENDWITNESS,
+        "grs1qzfpwn55tvkxcw0xwfa0g8k2gtlzlgkcq3z000e",
+        marks=pytest.mark.altcoin,
+    ),
+    pytest.param(
+        "Groestlcoin Testnet",
+        "86'/1'/0'/0/0",
+        messages.InputScriptType.SPENDTAPROOT,
+        "tgrs1pswrqtykue8r89t9u4rprjs0gt4qzkdfuursfnvqaa3f2yql07zmq5v2q7z",
+        marks=pytest.mark.altcoin,
+    ),
+    pytest.param(
+        "Groestlcoin",
+        "86'/17'/0'/0/0",
+        messages.InputScriptType.SPENDTAPROOT,
+        "grs1pnacleslusvh6gdjd3j2y5kv3drq09038sww2zx4za68jssndmu6qkm698g",
+        marks=pytest.mark.altcoin,
+    ),
     pytest.param(
         "Elements",
         "84'/1'/0'/0/0",
diff --git a/tests/device_tests/bitcoin/test_grs.py b/tests/device_tests/bitcoin/test_grs.py
index c00bd5b9c0..8f29cfb1f7 100644
--- a/tests/device_tests/bitcoin/test_grs.py
+++ b/tests/device_tests/bitcoin/test_grs.py
@@ -1,6 +1,6 @@
 # This file is part of the Trezor project.
 #
-# Copyright (C) 2012-2019 SatoshiLabs and contributors
+# Copyright (C) 2012-2021 SatoshiLabs and contributors
 #
 # This library is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Lesser General Public License version 3
@@ -34,6 +34,9 @@ TXHASH_09a48b = bytes.fromhex(
 TXHASH_4f2f85 = bytes.fromhex(
     "4f2f857f39ed1afe05542d058fb0be865a387446e32fc876d086203f483f61d1"
 )
+TXHASH_f79cf5 = bytes.fromhex(
+    "f79cf536f6516fb2808b4728c403be98aebef49fec5ba206a0a397527214e929"
+)
 
 pytestmark = pytest.mark.altcoin
 
@@ -214,3 +217,27 @@ def test_send_segwit_native_change(client):
         serialized_tx.hex()
         == "01000000000101d1613f483f2086d076c82fe34674385a86beb08f052d5405fe1aed397f852f4f0000000000feffffff02404b4c000000000017a9147a55d61848e77ca266e79a39bfc85c580a6426c987a8386f0000000000160014cc8067093f6f843d6d3e22004a4290cd0c0f336b02483045022100ea8780bc1e60e14e945a80654a41748bbf1aa7d6f2e40a88d91dfc2de1f34bd10220181a474a3420444bd188501d8d270736e1e9fe379da9970de992ff445b0972e3012103adc58245cf28406af0ef5cc24b8afba7f1be6c72f279b642d85c48798685f862d9ed0900"
     )
+
+
+def test_send_p2tr(client):
+    inp1 = messages.TxInputType(
+        # tgrs1pswrqtykue8r89t9u4rprjs0gt4qzkdfuursfnvqaa3f2yql07zmq5v2q7z
+        address_n=parse_path("86'/1'/0'/0/0"),
+        amount=4600,
+        prev_hash=TXHASH_f79cf5,
+        prev_index=1,
+        script_type=messages.InputScriptType.SPENDTAPROOT,
+    )
+    out1 = messages.TxOutputType(
+        # 86'/1'/1'/0/0
+        address="tgrs1paxhjl357yzctuf3fe58fcdx6nul026hhh6kyldpfsf3tckj9a3wsvuqrgn",
+        amount=4450,
+        script_type=messages.OutputScriptType.PAYTOADDRESS,
+    )
+    _, serialized_tx = btc.sign_tx(
+        client, "Groestlcoin Testnet", [inp1], [out1], prev_txes=TX_API_TESTNET
+    )
+    assert (
+        serialized_tx.hex()
+        == "0100000000010129e914725297a3a006a25bec9ff4beae98be03c428478b80b26f51f636f59cf70100000000ffffffff016211000000000000225120e9af2fc69e20b0be2629cd0e9c34da9f3ef56af7beac4fb4298262bc5a45ec5d01400925acfe20ef34929aab585d0fe0a9c1b11219c1fc512f56572a0201e38f3bc38721a6afc9e19801a5c5bc6e806e07a6fc7412b2fc863057f528e3003855491600000000"
+    )