diff --git a/tests/test_registry.py b/tests/test_registry.py
index 13f735ca7..6570039d1 100644
--- a/tests/test_registry.py
+++ b/tests/test_registry.py
@@ -41,9 +41,9 @@ def test_countries_imports(self):
                 self.assertIsNotNone(loader_cls, entity)
                 self.assertIsNotNone(module_cls, entity)
                 self.assertEqual(countries_cls, module_cls)
-                self.assertTrue(isinstance(loader_cls, registry.EntityLoader))
-                self.assertTrue(isinstance(loader_cls(), countries_cls))
-                self.assertTrue(isinstance(loader_cls(), module_cls))
+                self.assertIsInstance(loader_cls, registry.EntityLoader)
+                self.assertIsInstance(loader_cls(), countries_cls)
+                self.assertIsInstance(loader_cls(), module_cls)
 
                 loader_entities.add(loader_cls.__name__)
 
@@ -82,9 +82,9 @@ def test_financial_imports(self):
                 self.assertIsNotNone(loader_cls, entity)
                 self.assertIsNotNone(module_cls, entity)
                 self.assertEqual(financial_cls, module_cls)
-                self.assertTrue(isinstance(loader_cls, registry.EntityLoader))
-                self.assertTrue(isinstance(loader_cls(), financial_cls))
-                self.assertTrue(isinstance(loader_cls(), module_cls))
+                self.assertIsInstance(loader_cls, registry.EntityLoader)
+                self.assertIsInstance(loader_cls(), financial_cls)
+                self.assertIsInstance(loader_cls(), module_cls)
 
                 loader_entities.add(loader_cls.__name__)
 
@@ -115,7 +115,7 @@ class SubClass(parent):
             return SubClass()
 
         for cls in (holidays.UnitedStates, holidays.US, holidays.USA):
-            self.assertTrue(isinstance(cls, holidays.registry.EntityLoader))
+            self.assertIsInstance(cls, holidays.registry.EntityLoader)
             with self.assertRaises(TypeError):
                 create_instance(cls)
 
@@ -124,4 +124,4 @@ class SubClass(parent):
             holidays.countries.US,
             holidays.countries.USA,
         ):
-            self.assertTrue(isinstance(create_instance(cls), holidays.countries.UnitedStates))
+            self.assertIsInstance(create_instance(cls), holidays.countries.UnitedStates)
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 3d7ba7a15..bb8a6309d 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -177,10 +177,7 @@ def assertLocalizedEntities(self, localized_entities, supported_entities):
             )
 
             if expected_languages:
-                self.assertTrue(
-                    isinstance(expected_languages, list),
-                    entity_code,
-                )
+                self.assertIsInstance(expected_languages, list, entity_code)
                 self.assertIn(
                     entity.default_language,
                     expected_languages,
@@ -212,7 +209,7 @@ def test_list_supported_countries(self):
 
         us_subdivisions = supported_countries["US"]
         self.assertIn("CA", us_subdivisions)
-        self.assertTrue(isinstance(us_subdivisions, list))
+        self.assertIsInstance(us_subdivisions, list)
 
         countries_files = [
             path for path in Path("holidays/countries").glob("*.py") if path.stem != "__init__"
@@ -229,7 +226,7 @@ def test_list_supported_financial(self):
         self.assertIn("NYSE", supported_financial)
 
         nyse = supported_financial["NYSE"]
-        self.assertTrue(isinstance(nyse, list))
+        self.assertIsInstance(nyse, list)
 
         financial_files = [
             path for path in Path("holidays/financial").glob("*.py") if path.stem != "__init__"