diff --git a/tfjs-converter/python/tensorflowjs/converters/converter_test.py b/tfjs-converter/python/tensorflowjs/converters/converter_test.py
index 06d6aafdd64..fa1fc5fb940 100644
--- a/tfjs-converter/python/tensorflowjs/converters/converter_test.py
+++ b/tfjs-converter/python/tensorflowjs/converters/converter_test.py
@@ -302,7 +302,7 @@ def testConvertKerasModelToTfGraphModel(self):
     with open(os.path.join(output_dir, 'model.json'), 'rt') as f:
       model_json = json.load(f)
     self.assertTrue(model_json['modelTopology'])
-    self.assertTrue(model_json['modelTopology']['versions'] is not None)
+    self.assertIsNot(model_json['modelTopology']['versions'], None)
     weights_manifest = model_json['weightsManifest']
     self.assertEqual(len(weights_manifest), 1)
     # Check meta-data in the artifact JSON.
diff --git a/tfjs-converter/python/tensorflowjs/converters/tf_saved_model_conversion_v2_test.py b/tfjs-converter/python/tensorflowjs/converters/tf_saved_model_conversion_v2_test.py
index 2b8827030ec..46797d5a586 100644
--- a/tfjs-converter/python/tensorflowjs/converters/tf_saved_model_conversion_v2_test.py
+++ b/tfjs-converter/python/tensorflowjs/converters/tf_saved_model_conversion_v2_test.py
@@ -296,7 +296,7 @@ def test_convert_saved_model_v1(self):
     with open(os.path.join(tfjs_path, 'model.json'), 'rt') as f:
       model_json = json.load(f)
     self.assertTrue(model_json['modelTopology'])
-    self.assertTrue(model_json['modelTopology']['versions'] is not None)
+    self.assertIsNot(model_json['modelTopology']['versions'], None)
     weights_manifest = model_json['weightsManifest']
     self.assertCountEqual(weights_manifest[0]['paths'],
                           ['group1-shard1of1.bin'])
@@ -330,7 +330,7 @@ def test_convert_saved_model_v1_with_hashtable(self):
     with open(os.path.join(tfjs_path, 'model.json'), 'rt') as f:
       model_json = json.load(f)
     self.assertTrue(model_json['modelTopology'])
-    self.assertTrue(model_json['modelTopology']['versions'] is not None)
+    self.assertIsNot(model_json['modelTopology']['versions'], None)
     weights_manifest = model_json['weightsManifest']
     self.assertEqual(weights_manifest, expected_weights_manifest)
     # Check meta-data in the artifact JSON.
@@ -355,7 +355,7 @@ def test_convert_saved_model(self):
     with open(os.path.join(tfjs_path, 'model.json'), 'rt') as f:
       model_json = json.load(f)
     self.assertTrue(model_json['modelTopology'])
-    self.assertTrue(model_json['modelTopology']['versions'] is not None)
+    self.assertIsNot(model_json['modelTopology']['versions'], None)
     weights_manifest = model_json['weightsManifest']
     self.assertCountEqual(weights_manifest[0]['paths'],
                           ['group1-shard1of1.bin'])
@@ -373,7 +373,7 @@ def test_convert_saved_model_with_fused_conv2d(self):
     with open(os.path.join(tfjs_path, 'model.json'), 'rt') as f:
       model_json = json.load(f)
     self.assertTrue(model_json['modelTopology'])
-    self.assertTrue(model_json['modelTopology']['versions'] is not None)
+    self.assertIsNot(model_json['modelTopology']['versions'], None)
     nodes = model_json['modelTopology']['node']
 
     fusedOp = None
@@ -414,7 +414,7 @@ def test_convert_saved_model_with_prelu(self):
     with open(os.path.join(tfjs_path, 'model.json'), 'rt') as f:
       model_json = json.load(f)
     self.assertTrue(model_json['modelTopology'])
-    self.assertTrue(model_json['modelTopology']['versions'] is not None)
+    self.assertIsNot(model_json['modelTopology']['versions'], None)
     nodes = model_json['modelTopology']['node']
 
     prelu_op = None
@@ -454,7 +454,7 @@ def test_convert_saved_model_with_unfusable_prelu(self):
     with open(os.path.join(tfjs_path, 'model.json'), 'rt') as f:
       model_json = json.load(f)
     self.assertTrue(model_json['modelTopology'])
-    self.assertTrue(model_json['modelTopology']['versions'] is not None)
+    self.assertIsNot(model_json['modelTopology']['versions'], None)
     nodes = model_json['modelTopology']['node']
 
     prelu_op = None
@@ -489,7 +489,7 @@ def test_convert_saved_model_with_control_flow(self):
     with open(os.path.join(tfjs_path, 'model.json'), 'rt') as f:
       model_json = json.load(f)
     self.assertTrue(model_json['modelTopology'])
-    self.assertTrue(model_json['modelTopology']['versions'] is not None)
+    self.assertIsNot(model_json['modelTopology']['versions'], None)
     weights_manifest = model_json['weightsManifest']
     self.assertCountEqual(weights_manifest[0]['paths'],
                           ['group1-shard1of1.bin'])
@@ -528,7 +528,7 @@ def test_convert_saved_model_skip_op_check(self):
     with open(os.path.join(tfjs_path, 'model.json'), 'rt') as f:
       model_json = json.load(f)
     self.assertTrue(model_json['modelTopology'])
-    self.assertTrue(model_json['modelTopology']['versions'] is not None)
+    self.assertIsNot(model_json['modelTopology']['versions'], None)
     weights_manifest = model_json['weightsManifest']
     self.assertCountEqual(weights_manifest[0]['paths'],
                           ['group1-shard1of1.bin'])
@@ -553,7 +553,7 @@ def test_convert_saved_model_strip_debug_ops(self):
     with open(os.path.join(tfjs_path, 'model.json'), 'rt') as f:
       model_json = json.load(f)
     self.assertTrue(model_json['modelTopology'])
-    self.assertTrue(model_json['modelTopology']['versions'] is not None)
+    self.assertIsNot(model_json['modelTopology']['versions'], None)
     weights_manifest = model_json['weightsManifest']
     self.assertCountEqual(weights_manifest[0]['paths'],
                           ['group1-shard1of1.bin'])
@@ -573,7 +573,7 @@ def test_convert_hub_module_v1(self):
     with open(os.path.join(tfjs_path, 'model.json'), 'rt') as f:
       model_json = json.load(f)
     self.assertTrue(model_json['modelTopology'])
-    self.assertTrue(model_json['modelTopology']['versions'] is not None)
+    self.assertIsNot(model_json['modelTopology']['versions'], None)
     weights_manifest = model_json['weightsManifest']
     self.assertCountEqual(weights_manifest[0]['paths'],
                           ['group1-shard1of1.bin'])
@@ -595,7 +595,7 @@ def test_convert_hub_module_v2(self):
     with open(os.path.join(tfjs_path, 'model.json'), 'rt') as f:
       model_json = json.load(f)
     self.assertTrue(model_json['modelTopology'])
-    self.assertTrue(model_json['modelTopology']['versions'] is not None)
+    self.assertIsNot(model_json['modelTopology']['versions'], None)
     weights_manifest = model_json['weightsManifest']
     self.assertCountEqual(weights_manifest[0]['paths'],
                           ['group1-shard1of1.bin'])
@@ -620,8 +620,7 @@ def test_convert_frozen_model(self):
     with open(os.path.join(tfjs_path, 'model.json'), 'rt') as f:
       model_json = json.load(f)
     self.assertTrue(model_json['modelTopology'])
-    self.assertTrue(model_json['modelTopology']['versions'] is not None)
-    weights_manifest = model_json['weightsManifest']
+    self.assertIsNot(model_json['modelTopology']['versions'], None)
     weights_manifest = model_json['weightsManifest']
     self.assertCountEqual(weights_manifest[0]['paths'],
                           ['group1-shard1of1.bin'])
diff --git a/tfjs-converter/python/test_pip_package.py b/tfjs-converter/python/test_pip_package.py
index b97c91fa1db..5a07f3faa48 100644
--- a/tfjs-converter/python/test_pip_package.py
+++ b/tfjs-converter/python/test_pip_package.py
@@ -560,7 +560,7 @@ def testConvertTFFrozenModelWithCommandLineWorks(self):
     with open(os.path.join(output_dir, 'model.json'), 'rt') as f:
       model_json = json.load(f)
     self.assertTrue(model_json['modelTopology'])
-    self.assertTrue(model_json['modelTopology']['versions'] is not None)
+    self.assertIsNot(model_json['modelTopology']['versions'], None)
     weights_manifest = model_json['weightsManifest']
     weights_manifest = model_json['weightsManifest']
     self.assertCountEqual(weights_manifest[0]['paths'],