diff --git a/cinderlib/tests/functional/test_basic.py b/cinderlib/tests/functional/test_basic.py
index 451bfb6..026f139 100644
--- a/cinderlib/tests/functional/test_basic.py
+++ b/cinderlib/tests/functional/test_basic.py
@@ -49,7 +49,7 @@ class BaseFunctTestCase(base_tests.unittest.TestCase):
             for option in driver_info['driver_options']:
                 self.assertIsInstance(option['type'], expected_type)
                 if is_v2:
-                    self.assertTrue('type_class' in option['type'])
+                    self.assertIn('type_class', option['type'])
                 else:
                     for v in option.values():
                         self.assertIsInstance(v, str)
diff --git a/cinderlib/tests/unit/persistence/test_memory.py b/cinderlib/tests/unit/persistence/test_memory.py
index 4a93938..3de1c4d 100644
--- a/cinderlib/tests/unit/persistence/test_memory.py
+++ b/cinderlib/tests/unit/persistence/test_memory.py
@@ -88,5 +88,5 @@ class TestMemoryPersistence(base.BasePersistenceTest):
         self.assertDictEqual({}, self.persistence.key_values)
         expected = [cinderlib.KeyValue('key', 'value')]
         self.persistence.set_key_value(expected[0])
-        self.assertTrue('key' in self.persistence.key_values)
+        self.assertIn('key', self.persistence.key_values)
         self.assertEqual(expected, list(self.persistence.key_values.values()))
diff --git a/cinderlib/tests/unit/test_cinderlib.py b/cinderlib/tests/unit/test_cinderlib.py
index cd79258..ccf7925 100644
--- a/cinderlib/tests/unit/test_cinderlib.py
+++ b/cinderlib/tests/unit/test_cinderlib.py
@@ -52,7 +52,7 @@ class TestCinderlib(base.BaseTest):
             for option in driver_info['driver_options']:
                 self.assertIsInstance(option['type'], expected_type)
                 if is_v2:
-                    self.assertTrue('type_class' in option['type'])
+                    self.assertIn('type_class', option['type'])
                 else:
                     for v in option.values():
                         self.assertIsInstance(v, str)
diff --git a/test-requirements.txt b/test-requirements.txt
index ac8ee6e..97d223b 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,7 +3,7 @@
 # process, which may cause wedges in the gate later.
 
 pbr>=5.4.1 # Apache-2.0
-hacking>=3.0.1,<3.2.0 # Apache-2.0
+hacking>=4.0.0,<4.1.0 # Apache-2.0
 coverage!=4.4,>=4.1 # Apache-2.0
 ddt>=1.2.1 # MIT
 oslotest>=3.2.0 # Apache-2.0