diff --git a/.travis.yml b/.travis.yml
index fdec0b8..05d69f9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,16 +5,10 @@ python:
   - "3.9"
   - "3.8"
   - "3.7"
-  - "3.6"
-  - "3.5"
 matrix:
  include:
-   - python: 3.4
+   - python: 3.8
      dist: xenial
-   - python: 2.7
-     before_install:
-       - pip install -U mock
-       - pip install -U pytest
 # command to install dependencies
 install:
   - pip install -r requirements.txt && pip install -e .
diff --git a/README.en.md b/README.en.md
index ed67490..f41eb8a 100644
--- a/README.en.md
+++ b/README.en.md
@@ -11,7 +11,7 @@ This product is used for managing payments under [The YooKassa API](https://yook
 For usage by those who implemented YooKassa using the API method.
 
 ## Requirements
-1. Python 2.7 or Python 3.x
+1. Python >=3.7
 2. pip
 
 ## Installation
diff --git a/README.md b/README.md
index 550d940..7f81caf 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ Russian | [English](https://github.com/yoomoney/yookassa-sdk-python/blob/master/
 
 ## Требования
 
-1. Python 3.x
+1. Python >=3.7
 2. pip
 
 ## Установка
diff --git a/setup.py b/setup.py
index 252f22d..fe996a4 100644
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,7 @@
 For usage by those who implemented YooKassa using the API method.
 
 ## Requirements
-1. Python 2.7 or Python 3.x
+1. Python >=3.7
 2. pip
 
 ## Installation
@@ -113,17 +113,14 @@
     url="https://github.com/yoomoney/yookassa-sdk-python",
     package_dir={"": "src"},
     packages=find_packages('src'),
-    install_requires=["requests", "urllib3", "netaddr", "distro", "deprecated"],
+    install_requires=["httpx", "requests", "urllib3", "netaddr", "distro", "deprecated"],
     zip_safe=False,
     license="MIT",
     classifiers=[
         "License :: OSI Approved :: MIT License",
-        "Programming Language :: Python :: 2.7",
-        "Programming Language :: Python :: 3.4",
-        "Programming Language :: Python :: 3.5",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
-        "Programming Language :: Python :: 3.9"
+        "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10"
     ]
 )
diff --git a/test/unit/test_client.py b/test/unit/test_client.py
index f7e3ffe..6bbb88e 100644
--- a/test/unit/test_client.py
+++ b/test/unit/test_client.py
@@ -17,7 +17,7 @@
 from yookassa.domain.common.request_object import RequestObject
 
 
-class TestClient(unittest.TestCase):
+class TestClient(unittest.IsolatedAsyncioTestCase):
 
     def setUp(self):
         Configuration.configure(account_id='test_account_id', secret_key='test_secret_key')
@@ -25,7 +25,7 @@ def setUp(self):
         Configuration.agent_cms = Version('YooMoney.Cms', '0.0.2')
         Configuration.agent_module = Version('YooMoney.Module', '0.0.3')
 
-    def test_request(self):
+    async def test_request(self):
         client = ApiClient()
         with patch('yookassa.client.ApiClient.request') as request_mock:
             request_mock.return_value = {
@@ -39,9 +39,9 @@ def test_request(self):
                 'status': 'canceled'
             }
 
-            client.request(HttpVerb.POST, '/path', RequestObject(), {'header': 'header'})
+            await client.request(HttpVerb.POST, '/path', RequestObject(), {'header': 'header'})
 
-    def test_execute(self):
+    async def test_execute(self):
         client = ApiClient()
         with patch('yookassa.client.ApiClient.execute') as request_mock:
             res = Response()
@@ -49,4 +49,4 @@ def test_execute(self):
             res._content = b"{}"
             request_mock.return_value = res
 
-            client.request(HttpVerb.POST, '/path', RequestObject({"param": "param"}), {'header': 'header'})
+            await client.request(HttpVerb.POST, '/path', RequestObject({"param": "param"}), {'header': 'header'})
diff --git a/test/unit/test_deal.py b/test/unit/test_deal.py
index 187d9bc..888ce49 100644
--- a/test/unit/test_deal.py
+++ b/test/unit/test_deal.py
@@ -2,10 +2,7 @@
 import sys
 import unittest
 
-if sys.version_info >= (3, 3):
-    from unittest.mock import patch
-else:
-    from mock import patch
+from unittest.mock import patch
 
 from yookassa.configuration import Configuration
 from yookassa.domain.models.amount import Amount
@@ -14,11 +11,11 @@
 from yookassa.deal import Deal
 
 
-class TestDealFacade(unittest.TestCase):
+class TestDealFacade(unittest.IsolatedAsyncioTestCase):
     def setUp(self):
         Configuration.configure(account_id='test_account_id', secret_key='test_secret_key')
 
-    def test_create_deal_with_dict(self):
+    async def test_create_deal_with_dict(self):
         self.maxDiff = None
         deal_facade = Deal()
         with patch('yookassa.client.ApiClient.request') as request_mock:
@@ -43,7 +40,7 @@ def test_create_deal_with_dict(self):
                 "description": "SAFE_DEAL 123554642-2432FF344R",
                 "test": False
             }
-            deal = deal_facade.create({
+            deal = await deal_facade.create({
                 "type": "safe_deal",
                 "fee_moment": "deal_closed",
                 "metadata": {
@@ -56,7 +53,7 @@ def test_create_deal_with_dict(self):
         self.assertIsInstance(deal.balance, Amount)
         self.assertIsInstance(deal.payout_balance, Amount)
 
-    def test_create_deal_with_object(self):
+    async def test_create_deal_with_object(self):
         self.maxDiff = None
         deal_facade = Deal()
         with patch('yookassa.client.ApiClient.request') as request_mock:
@@ -81,7 +78,7 @@ def test_create_deal_with_object(self):
                 "description": "SAFE_DEAL 123554642-2432FF344R",
                 "test": False
             }
-            deal = deal_facade.create(DealRequest({
+            deal = await deal_facade.create(DealRequest({
                 "type": "safe_deal",
                 "fee_moment": "deal_closed",
                 "metadata": {
@@ -94,7 +91,7 @@ def test_create_deal_with_object(self):
         self.assertIsInstance(deal.balance, Amount)
         self.assertIsInstance(deal.payout_balance, Amount)
 
-    def test_deal_info(self):
+    async def test_deal_info(self):
         deal_facade = Deal()
         with patch('yookassa.client.ApiClient.request') as request_mock:
             request_mock.return_value = {
@@ -118,13 +115,13 @@ def test_deal_info(self):
                 "description": "SAFE_DEAL 123554642-2432FF344R",
                 "test": False
             }
-            deal = deal_facade.find_one('dl-285e5ee7-0022-5000-8000-01516a44b147')
+            deal = await deal_facade.find_one('dl-285e5ee7-0022-5000-8000-01516a44b147')
 
         self.assertIsInstance(deal, DealResponse)
         self.assertIsInstance(deal.balance, Amount)
         self.assertIsInstance(deal.payout_balance, Amount)
 
-    def test_deal_list(self):
+    async def test_deal_list(self):
         deal_facade = Deal()
         with patch('yookassa.client.ApiClient.request') as request_mock:
             request_mock.return_value = {
@@ -154,7 +151,7 @@ def test_deal_list(self):
                 "type": "list",
                 "next_cursor": "37a5c87d-3984-51e8-a7f3-8de646d39ec15"
             }
-            deal = deal_facade.list({
+            deal = await deal_facade.list({
                 'status': 'closed',
                 'limit': 1
             })
@@ -162,9 +159,11 @@ def test_deal_list(self):
             self.assertIsInstance(deal, DealListResponse)
             self.assertIsInstance(deal.items, list)
 
-    def test_invalid_data(self):
+    async def test_invalid_data(self):
         with self.assertRaises(ValueError):
-            Deal().find_one('')
+            deal = Deal()
+            await deal.find_one('')
 
         with self.assertRaises(TypeError):
-            Deal().create('invalid params')
+            deal = Deal()
+            await deal.create('invalid params')
diff --git a/test/unit/test_payment_facade.py b/test/unit/test_payment_facade.py
index b62c9ff..1f1ef48 100644
--- a/test/unit/test_payment_facade.py
+++ b/test/unit/test_payment_facade.py
@@ -2,10 +2,7 @@
 import sys
 import unittest
 
-if sys.version_info >= (3, 3):
-    from unittest.mock import patch
-else:
-    from mock import patch
+from unittest.mock import patch
 
 from yookassa.configuration import Configuration
 from yookassa.domain.models.amount import Amount
@@ -17,11 +14,11 @@
 from yookassa.payment import Payment
 
 
-class TestPaymentFacade(unittest.TestCase):
+class TestPaymentFacade(unittest.IsolatedAsyncioTestCase):
     def setUp(self):
         Configuration.configure(account_id='test_account_id', secret_key='test_secret_key')
 
-    def test_create_payment_with_dict(self):
+    async def test_create_payment_with_dict(self):
         self.maxDiff = None
         payment_facade = Payment()
         with patch('yookassa.client.ApiClient.request') as request_mock:
@@ -35,7 +32,7 @@ def test_create_payment_with_dict(self):
                 'recipient': {'account_id': '156833', 'gateway_id': '468284'},
                 'status': 'waiting_for_capture'
             }
-            payment = payment_facade.create({
+            payment = await payment_facade.create({
                 "amount": {
                     "value": "1.00",
                     "currency": "RUB"
@@ -74,7 +71,7 @@ def test_create_payment_with_dict(self):
         self.assertIsInstance(payment.amount, Amount)
         self.assertIsInstance(payment.payment_method, PaymentDataBankCard)
 
-    def test_create_payment_with_object(self):
+    async def test_create_payment_with_object(self):
         self.maxDiff = None
         payment_facade = Payment()
         with patch('yookassa.client.ApiClient.request') as request_mock:
@@ -88,7 +85,7 @@ def test_create_payment_with_object(self):
                 'recipient': {'account_id': '156833', 'gateway_id': '468284'},
                 'status': 'waiting_for_capture'
             }
-            payment = payment_facade.create(PaymentRequest({
+            payment = await payment_facade.create(PaymentRequest({
                 "amount": {
                     "value": "1.00",
                     "currency": "RUB"
@@ -127,7 +124,7 @@ def test_create_payment_with_object(self):
         self.assertIsInstance(payment.amount, Amount)
         self.assertIsInstance(payment.payment_method, PaymentDataBankCard)
 
-    def test_create_capture_with_dict(self):
+    async def test_create_capture_with_dict(self):
         payment_facade = Payment()
         with patch('yookassa.client.ApiClient.request') as request_mock:
             request_mock.return_value = {
@@ -141,7 +138,7 @@ def test_create_capture_with_dict(self):
                 'status': 'waiting_for_capture'
             }
 
-            payment = payment_facade.capture('21b23b5b-000f-5061-a000-0674e49a8c10', {
+            payment = await payment_facade.capture('21b23b5b-000f-5061-a000-0674e49a8c10', {
                 "amount": {
                     "value": "1.00",
                     "currency": "RUB"
@@ -180,7 +177,7 @@ def test_create_capture_with_dict(self):
         self.assertIsInstance(payment.amount, Amount)
         self.assertIsInstance(payment.payment_method, PaymentDataBankCard)
 
-    def test_create_capture_with_object(self):
+    async def test_create_capture_with_object(self):
         payment_facade = Payment()
         with patch('yookassa.client.ApiClient.request') as request_mock:
             request_mock.return_value = {
@@ -194,7 +191,7 @@ def test_create_capture_with_object(self):
                 'status': 'waiting_for_capture'
             }
 
-            payment = payment_facade.capture('21b23b5b-000f-5061-a000-0674e49a8c10', CapturePaymentRequest({
+            payment = await payment_facade.capture('21b23b5b-000f-5061-a000-0674e49a8c10', CapturePaymentRequest({
                 "amount": {
                     "value": "1.00",
                     "currency": "RUB"
@@ -233,7 +230,7 @@ def test_create_capture_with_object(self):
         self.assertIsInstance(payment.amount, Amount)
         self.assertIsInstance(payment.payment_method, PaymentDataBankCard)
 
-    def test_create_capture(self):
+    async def test_create_capture(self):
         payment_facade = Payment()
         with patch('yookassa.client.ApiClient.request') as request_mock:
             request_mock.return_value = {
@@ -247,13 +244,13 @@ def test_create_capture(self):
                 'status': 'waiting_for_capture'
             }
 
-            payment = payment_facade.capture('21b23b5b-000f-5061-a000-0674e49a8c10')
+            payment = await payment_facade.capture('21b23b5b-000f-5061-a000-0674e49a8c10')
 
         self.assertIsInstance(payment, PaymentResponse)
         self.assertIsInstance(payment.amount, Amount)
         self.assertIsInstance(payment.payment_method, PaymentDataBankCard)
 
-    def test_payment_info(self):
+    async def test_payment_info(self):
         payment_facade = Payment()
         with patch('yookassa.client.ApiClient.request') as request_mock:
             request_mock.return_value = {
@@ -266,13 +263,13 @@ def test_payment_info(self):
                 'recipient': {'account_id': '156833', 'gateway_id': '468284'},
                 'status': 'waiting_for_capture'
             }
-            payment = payment_facade.find_one('21b23b5b-000f-5061-a000-0674e49a8c10')
+            payment = await payment_facade.find_one('21b23b5b-000f-5061-a000-0674e49a8c10')
 
         self.assertIsInstance(payment, PaymentResponse)
         self.assertIsInstance(payment.amount, Amount)
         self.assertIsInstance(payment.payment_method, PaymentDataBankCard)
 
-    def test_payment_cancel(self):
+    async def test_payment_cancel(self):
         payment_facade = Payment()
         with patch('yookassa.client.ApiClient.request') as request_mock:
             request_mock.return_value = {
@@ -285,13 +282,13 @@ def test_payment_cancel(self):
                 'recipient': {'account_id': '156833', 'gateway_id': '468284'},
                 'status': 'canceled'
             }
-            payment = payment_facade.cancel('21b23b5b-000f-5061-a000-0674e49a8c10')
+            payment = await payment_facade.cancel('21b23b5b-000f-5061-a000-0674e49a8c10')
 
         self.assertIsInstance(payment, PaymentResponse)
         self.assertIsInstance(payment.amount, Amount)
         self.assertIsInstance(payment.payment_method, PaymentDataBankCard)
 
-    def test_payment_list(self):
+    async def test_payment_list(self):
         payment_facade = Payment()
         with patch('yookassa.client.ApiClient.request') as request_mock:
             request_mock.return_value = {
@@ -322,7 +319,7 @@ def test_payment_list(self):
                 ],
                 'next_page': '2018-08-02 08:24:01.180;48539871',
                 'type': 'list'}
-            payment = payment_facade.list({
+            payment = await payment_facade.list({
                 'status': 'succeeded',
                 'limit': 1
             })
@@ -330,15 +327,19 @@ def test_payment_list(self):
             self.assertIsInstance(payment, PaymentListResponse)
             self.assertIsInstance(payment.items, list)
 
-    def test_invalid_data(self):
+    async def test_invalid_data(self):
         with self.assertRaises(ValueError):
-            Payment().find_one('')
+            payment = Payment()
+            await payment.find_one('')
 
         with self.assertRaises(TypeError):
-            Payment().create('invalid params')
+            payment = Payment()
+            await payment.create('invalid params')
 
         with self.assertRaises(ValueError):
-            Payment().capture(111)
+            payment = Payment()
+            await payment.capture(111)
 
         with self.assertRaises(ValueError):
-            Payment().cancel('')
+            payment = Payment()
+            await payment.cancel('')
diff --git a/test/unit/test_payout.py b/test/unit/test_payout.py
index 217c93e..2a77810 100644
--- a/test/unit/test_payout.py
+++ b/test/unit/test_payout.py
@@ -6,10 +6,7 @@
 from yookassa.domain.models.payout_data.payout_destination import PayoutDestination
 from yookassa.domain.models.payout_data.response.payout_destination_bank_card import PayoutDestinationBankCard
 
-if sys.version_info >= (3, 3):
-    from unittest.mock import patch
-else:
-    from mock import patch
+from unittest.mock import patch
 
 from yookassa.configuration import Configuration
 from yookassa.domain.models.amount import Amount
@@ -18,11 +15,11 @@
 from yookassa.payout import Payout
 
 
-class TestPayoutFacade(unittest.TestCase):
+class TestPayoutFacade(unittest.IsolatedAsyncioTestCase):
     def setUp(self):
         Configuration.configure(account_id='test_account_id', secret_key='test_secret_key')
 
-    def test_create_payout_with_dict(self):
+    async def test_create_payout_with_dict(self):
         self.maxDiff = None
         payout_facade = Payout()
         with patch('yookassa.client.ApiClient.request') as request_mock:
@@ -53,7 +50,7 @@ def test_create_payout_with_dict(self):
                 },
                 "test": False
             }
-            payout = payout_facade.create({
+            payout = await payout_facade.create({
                 "amount": {
                     "value": 320.0,
                     "currency": Currency.RUB
@@ -79,7 +76,7 @@ def test_create_payout_with_dict(self):
         self.assertIsInstance(payout.metadata, dict)
         self.assertIsInstance(payout.deal, PayoutDealInfo)
 
-    def test_create_payout_with_object(self):
+    async def test_create_payout_with_object(self):
         self.maxDiff = None
         payout_facade = Payout()
         with patch('yookassa.client.ApiClient.request') as request_mock:
@@ -110,7 +107,7 @@ def test_create_payout_with_object(self):
                 },
                 "test": False
             }
-            payout = payout_facade.create(PayoutRequest({
+            payout = await payout_facade.create(PayoutRequest({
                 "amount": {
                     "value": 320.0,
                     "currency": Currency.RUB
@@ -130,7 +127,7 @@ def test_create_payout_with_object(self):
         self.assertIsInstance(payout.metadata, dict)
         self.assertIsInstance(payout.deal, PayoutDealInfo)
 
-    def test_payout_info(self):
+    async def test_payout_info(self):
         payout_facade = Payout()
         with patch('yookassa.client.ApiClient.request') as request_mock:
             request_mock.return_value = {
@@ -160,7 +157,7 @@ def test_payout_info(self):
                 },
                 "test": False
             }
-            payout = payout_facade.find_one('po-2855a19a-0003-5000-a000-0efa9e7f4264')
+            payout = await payout_facade.find_one('po-2855a19a-0003-5000-a000-0efa9e7f4264')
 
         self.assertIsInstance(payout, PayoutResponse)
         self.assertIsInstance(payout.amount, Amount)
@@ -168,9 +165,11 @@ def test_payout_info(self):
         self.assertIsInstance(payout.deal, PayoutDealInfo)
         self.assertIsInstance(payout.payout_destination, PayoutDestinationBankCard)
 
-    def test_invalid_data(self):
+    async def test_invalid_data(self):
         with self.assertRaises(ValueError):
-            Payout().find_one('')
+            payout = Payout()
+            await payout.find_one('')
 
         with self.assertRaises(TypeError):
-            Payout().create('invalid params')
+            payout = Payout()
+            await payout.create('invalid params')
diff --git a/test/unit/test_receipt.py b/test/unit/test_receipt.py
index 663732b..4473faa 100644
--- a/test/unit/test_receipt.py
+++ b/test/unit/test_receipt.py
@@ -17,12 +17,12 @@
 from yookassa.configuration import Configuration
 
 
-class TestReceipt(unittest.TestCase):
+class TestReceipt(unittest.IsolatedAsyncioTestCase):
 
     def setUp(self):
         Configuration.configure(account_id='test_account_id', secret_key='test_secret_key')
 
-    def test_list(self):
+    async def test_list(self):
         self.maxDiff = None
         with patch('yookassa.client.ApiClient.request') as request_mock:
             request_mock.return_value = {
@@ -55,13 +55,13 @@ def test_list(self):
             }
 
             params = {"refund_id": "24be8857-000f-5000-a000-1833ed1577f3"}
-            rec_list = Receipt.list(params)
+            rec_list = await Receipt.list(params)
 
             self.assertIsInstance(rec_list, ReceiptListResponse)
             self.assertEqual(rec_list.type, "list")
             self.assertIsInstance(rec_list.items[0], ReceiptResponse)
 
-    def test_create(self):
+    async def test_create(self):
         self.maxDiff = None
         with patch('yookassa.client.ApiClient.request') as request_mock:
             request_mock.return_value = {
@@ -142,7 +142,7 @@ def test_create(self):
                 'payment_id': '215d8da0-000f-50be-b000-0003308c89be',
                 'on_behalf_of': 'string'
             }
-            rec = Receipt.create(params)
+            rec = await Receipt.create(params)
 
             self.assertIsInstance(rec, ReceiptResponse)
             self.assertEqual(rec.type, ReceiptType.PAYMENT)
@@ -172,10 +172,10 @@ def test_create(self):
                 }))
             request.tax_system_code = 1
             request.payment_id = '215d8da0-000f-50be-b000-0003308c89be'
-            rec = Receipt.create(request)
+            rec = await Receipt.create(request)
 
             self.assertIsInstance(rec, ReceiptResponse)
             self.assertEqual(rec.type, "payment")
 
         with self.assertRaises(TypeError):
-            Receipt.create('invalid data')
+            await Receipt.create('invalid data')
diff --git a/test/unit/test_refund_facade.py b/test/unit/test_refund_facade.py
index b3933d8..304188d 100644
--- a/test/unit/test_refund_facade.py
+++ b/test/unit/test_refund_facade.py
@@ -4,10 +4,8 @@
 
 from yookassa import Configuration
 
-if sys.version_info >= (3, 3):
-    from unittest.mock import patch
-else:
-    from mock import patch
+
+from unittest.mock import patch
 
 from yookassa.domain.models.amount import Amount
 from yookassa.domain.request.refund_request import RefundRequest
@@ -15,12 +13,12 @@
 from yookassa.refund import Refund
 
 
-class TestRefundFacade(unittest.TestCase):
+class TestRefundFacade(unittest.IsolatedAsyncioTestCase):
 
     def setUp(self):
         Configuration.configure(account_id='test_account_id', secret_key='test_secret_key')
 
-    def test_create_payment_with_dict(self):
+    async def test_create_payment_with_dict(self):
         self.maxDiff = None
         refund_facade = Refund()
         with patch('yookassa.client.ApiClient.request') as request_mock:
@@ -34,7 +32,7 @@ def test_create_payment_with_dict(self):
                 "created_at": "2017-10-04T19:27:51.407Z",
                 "payment_id": "216749da-000f-50be-b000-096747fad91e"
             }
-            refund = refund_facade.create({
+            refund = await refund_facade.create({
                 "payment_id": "21b36369-000f-500b-9000-070b97dced26",
                 "amount": {
                     "value": 1000.01,
@@ -62,7 +60,7 @@ def test_create_payment_with_dict(self):
         self.assertIsInstance(refund, RefundResponse)
         self.assertIsInstance(refund.amount, Amount)
 
-    def test_create_payment_with_object(self):
+    async def test_create_payment_with_object(self):
 
         self.maxDiff = None
         refund_facade = Refund()
@@ -77,7 +75,7 @@ def test_create_payment_with_object(self):
                 "created_at": "2017-10-04T19:27:51.407Z",
                 "payment_id": "216749da-000f-50be-b000-096747fad91e"
             }
-            refund = refund_facade.create(RefundRequest({
+            refund = await refund_facade.create(RefundRequest({
                 "payment_id": "21b36369-000f-500b-9000-070b97dced26",
                 "amount": {
                     "value": 1000.01,
@@ -105,7 +103,7 @@ def test_create_payment_with_object(self):
         self.assertIsInstance(refund, RefundResponse)
         self.assertIsInstance(refund.amount, Amount)
 
-    def test_refund_info(self):
+    async def test_refund_info(self):
         self.maxDiff = None
         refund_facade = Refund()
         with patch('yookassa.client.ApiClient.request') as request_mock:
@@ -120,15 +118,16 @@ def test_refund_info(self):
                 "payment_id": "216749da-000f-50be-b000-096747fad91e"
             }
 
-            refund = refund_facade.find_one("216749f7-0016-50be-b000-078d43a63ae4")
+            refund = await refund_facade.find_one("216749f7-0016-50be-b000-078d43a63ae4")
 
         self.assertIsInstance(refund, RefundResponse)
         self.assertIsInstance(refund.amount, Amount)
 
-    def test_invalid_data(self):
+    async def test_invalid_data(self):
         with self.assertRaises(TypeError):
-            Refund().create('')
+            refund = Refund()
+            await refund.create('')
 
         with self.assertRaises(ValueError):
-            Refund().find_one('')
-
+            refund = Refund()
+            await refund.find_one('')
diff --git a/test/unit/test_settings.py b/test/unit/test_settings.py
index bd1c1e8..93f0d7a 100644
--- a/test/unit/test_settings.py
+++ b/test/unit/test_settings.py
@@ -2,20 +2,18 @@
 import sys
 import unittest
 
-if sys.version_info >= (3, 3):
-    from unittest.mock import patch
-else:
-    from mock import patch
+
+from unittest.mock import patch
 
 from yookassa import Settings, Configuration
 
 
-class TestSettings(unittest.TestCase):
+class TestSettings(unittest.IsolatedAsyncioTestCase):
 
     def setUp(self):
         Configuration.configure(account_id='test_account_id', secret_key='test_secret_key')
 
-    def test_get_account_settings(self):
+    async def test_get_account_settings(self):
         self.maxDiff = None
         with patch('yookassa.client.ApiClient.request') as request_mock:
             request_mock.return_value = {
@@ -28,7 +26,7 @@ def test_get_account_settings(self):
                     "bank_card"
                 ]
             }
-            settings = Settings.get_account_settings()
+            settings = await Settings.get_account_settings()
 
         self.assertIsInstance(settings, dict)
         self.assertIsInstance(settings['payment_methods'], list)
diff --git a/test/unit/test_webhook.py b/test/unit/test_webhook.py
index 101b1b4..dbef3f2 100644
--- a/test/unit/test_webhook.py
+++ b/test/unit/test_webhook.py
@@ -1,24 +1,20 @@
 # -*- coding: utf-8 -*-
-import sys
 import unittest
 
 from yookassa.domain.request import WebhookRequest
 from yookassa.domain.response import WebhookList, WebhookResponse
 
-if sys.version_info >= (3, 3):
-    from unittest.mock import patch
-else:
-    from mock import patch
+from unittest.mock import patch
 
 from yookassa import Configuration, Webhook
 
 
-class TestWebhook(unittest.TestCase):
+class TestWebhook(unittest.IsolatedAsyncioTestCase):
 
     def setUp(self):
         Configuration.configure(account_id='test_account_id', secret_key='test_secret_key')
 
-    def test_list(self):
+    async def test_list(self):
         self.maxDiff = None
         with patch('yookassa.client.ApiClient.request') as request_mock:
             request_mock.return_value = {
@@ -36,13 +32,13 @@ def test_list(self):
                     }
                 ]
             }
-            wh_list = Webhook.list()
+            wh_list = await Webhook.list()
 
             self.assertIsInstance(wh_list, WebhookList)
             self.assertEqual(wh_list.type, "list")
             self.assertIsInstance(wh_list.items[0], WebhookResponse)
 
-    def test_add(self):
+    async def test_add(self):
         self.maxDiff = None
         with patch('yookassa.client.ApiClient.request') as request_mock:
             request_mock.return_value = {
@@ -55,7 +51,7 @@ def test_add(self):
                 "event": "payment.succeeded",
                 "url": "https://www.merchant-website.com/notification_url",
             })
-            wh = Webhook.add(params)
+            wh = await Webhook.add(params)
 
             self.assertIsInstance(wh, WebhookResponse)
             self.assertEqual(wh.event, "payment.succeeded")
@@ -64,19 +60,19 @@ def test_add(self):
                 "event": "payment.succeeded",
                 "url": "https://www.merchant-website.com/notification_url",
             }
-            wh = Webhook.add(params)
+            wh = await Webhook.add(params)
 
             self.assertIsInstance(wh, WebhookResponse)
             self.assertEqual(wh.event, "payment.succeeded")
 
         with self.assertRaises(TypeError):
-            Webhook.add('invalid data')
+            await Webhook.add('invalid data')
 
-    def test_remove(self):
+    async def test_remove(self):
         self.maxDiff = None
         with patch('yookassa.client.ApiClient.request') as request_mock:
             request_mock.return_value = {}
 
-            response = Webhook.remove("wh-22d6d597-000f-5000-9000-145f6df21d6f")
+            response = await Webhook.remove("wh-22d6d597-000f-5000-9000-145f6df21d6f")
 
             self.assertIsInstance(response, WebhookResponse)