diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 08aef91b2..9b908c6db 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -32,7 +32,7 @@ repos:
       - id: flake8
         name: flake8
         additional_dependencies:
-          - hacking>=3.0.1,<3.1.0
+          - hacking>=6.1.0,<6.2.0
         language: python
         entry: flake8
         files: '^.*\.py$'
diff --git a/taskflow/jobs/backends/impl_zookeeper.py b/taskflow/jobs/backends/impl_zookeeper.py
index 1e45f0f71..91156cd34 100644
--- a/taskflow/jobs/backends/impl_zookeeper.py
+++ b/taskflow/jobs/backends/impl_zookeeper.py
@@ -856,4 +856,4 @@ class ZookeeperJobBoard(base.NotifyingJobBoard):
                                       "Failed to do post-connection"
                                       " initialization", cause=exc)
             finally:
-                del(exc_type, exc, exc_tb)
+                del (exc_type, exc, exc_tb)
diff --git a/taskflow/tests/unit/jobs/test_zk_job.py b/taskflow/tests/unit/jobs/test_zk_job.py
index 23d05050d..39871b9d0 100644
--- a/taskflow/tests/unit/jobs/test_zk_job.py
+++ b/taskflow/tests/unit/jobs/test_zk_job.py
@@ -271,12 +271,12 @@ class ZakeJobboardTest(test.TestCase, ZookeeperBoardTestMixin):
         with base.connect_close(self.board):
             self.board.register_entity(entity_instance)
         # Check '.entity' node has been created
-        self.assertTrue(self.board.entity_path in self.client.storage.paths)
+        self.assertIn(self.board.entity_path, self.client.storage.paths)
 
         conductor_entity_path = k_paths.join(self.board.entity_path,
                                              'conductor',
                                              conductor_name)
-        self.assertTrue(conductor_entity_path in self.client.storage.paths)
+        self.assertIn(conductor_entity_path, self.client.storage.paths)
         conductor_data = (
             self.client.storage.paths[conductor_entity_path]['data'])
         self.assertTrue(len(conductor_data) > 0)
diff --git a/taskflow/tests/unit/patterns/test_graph_flow.py b/taskflow/tests/unit/patterns/test_graph_flow.py
index 0fa756019..5212d0637 100644
--- a/taskflow/tests/unit/patterns/test_graph_flow.py
+++ b/taskflow/tests/unit/patterns/test_graph_flow.py
@@ -239,7 +239,7 @@ class GraphFlowTest(test.TestCase):
         tasks = set([task1, task2, f1])
         f = gf.Flow('test').add(task1, task2, f1)
         for (n, data) in f.iter_nodes():
-            self.assertTrue(n in tasks)
+            self.assertIn(n, tasks)
             self.assertDictEqual({}, data)
 
     def test_iter_links(self):
@@ -251,8 +251,8 @@ class GraphFlowTest(test.TestCase):
         tasks = set([task1, task2, f1])
         f = gf.Flow('test').add(task1, task2, f1)
         for (u, v, data) in f.iter_links():
-            self.assertTrue(u in tasks)
-            self.assertTrue(v in tasks)
+            self.assertIn(u, tasks)
+            self.assertIn(v, tasks)
             self.assertDictEqual({}, data)
 
 
diff --git a/taskflow/tests/unit/patterns/test_linear_flow.py b/taskflow/tests/unit/patterns/test_linear_flow.py
index 682467b35..d473fe3c9 100644
--- a/taskflow/tests/unit/patterns/test_linear_flow.py
+++ b/taskflow/tests/unit/patterns/test_linear_flow.py
@@ -130,7 +130,7 @@ class LinearFlowTest(test.TestCase):
         f = lf.Flow('test').add(task1, task2, task3)
         tasks = set([task1, task2, task3])
         for (node, data) in f.iter_nodes():
-            self.assertTrue(node in tasks)
+            self.assertIn(node, tasks)
             self.assertDictEqual({}, data)
 
     def test_iter_links(self):
@@ -140,6 +140,6 @@ class LinearFlowTest(test.TestCase):
         f = lf.Flow('test').add(task1, task2, task3)
         tasks = set([task1, task2, task3])
         for (u, v, data) in f.iter_links():
-            self.assertTrue(u in tasks)
-            self.assertTrue(v in tasks)
+            self.assertIn(u, tasks)
+            self.assertIn(v, tasks)
             self.assertDictEqual({'invariant': True}, data)
diff --git a/taskflow/tests/unit/patterns/test_unordered_flow.py b/taskflow/tests/unit/patterns/test_unordered_flow.py
index c5929069e..144459160 100644
--- a/taskflow/tests/unit/patterns/test_unordered_flow.py
+++ b/taskflow/tests/unit/patterns/test_unordered_flow.py
@@ -126,7 +126,7 @@ class UnorderedFlowTest(test.TestCase):
         f = uf.Flow('test')
         f.add(task2, task1)
         for (node, data) in f.iter_nodes():
-            self.assertTrue(node in tasks)
+            self.assertIn(node, tasks)
             self.assertDictEqual({}, data)
 
     def test_iter_links(self):