diff --git a/superset/db_engine_specs/base.py b/superset/db_engine_specs/base.py
index 94c568694e8af..23ccc821f8877 100644
--- a/superset/db_engine_specs/base.py
+++ b/superset/db_engine_specs/base.py
@@ -1614,9 +1614,7 @@ def get_impersonation_key(cls, user: Optional[User]) -> Any:
         return user.username if user else None
 
     @classmethod
-    def mask_encrypted_extra(
-        cls, encrypted_extra: Union[str, None]
-    ) -> Union[str, None]:
+    def mask_encrypted_extra(cls, encrypted_extra: Optional[str]) -> Optional[str]:
         """
         Mask ``encrypted_extra``.
 
@@ -1630,8 +1628,8 @@ def mask_encrypted_extra(
     # pylint: disable=unused-argument
     @classmethod
     def unmask_encrypted_extra(
-        cls, old: Union[str, None], new: Union[str, None]
-    ) -> Union[str, None]:
+        cls, old: Optional[str], new: Optional[str]
+    ) -> Optional[str]:
         """
         Remove masks from ``encrypted_extra``.
 
diff --git a/superset/db_engine_specs/bigquery.py b/superset/db_engine_specs/bigquery.py
index 927fca31a5a0a..4b142761ddeec 100644
--- a/superset/db_engine_specs/bigquery.py
+++ b/superset/db_engine_specs/bigquery.py
@@ -18,7 +18,7 @@
 import re
 import urllib
 from datetime import datetime
-from typing import Any, Dict, List, Optional, Pattern, Tuple, Type, TYPE_CHECKING, Union
+from typing import Any, Dict, List, Optional, Pattern, Tuple, Type, TYPE_CHECKING
 
 import pandas as pd
 from apispec import APISpec
@@ -396,9 +396,7 @@ def get_parameters_from_uri(
         raise ValidationError("Invalid service credentials")
 
     @classmethod
-    def mask_encrypted_extra(
-        cls, encrypted_extra: Union[str, None]
-    ) -> Union[str, None]:
+    def mask_encrypted_extra(cls, encrypted_extra: Optional[str]) -> Optional[str]:
         try:
             config = json.loads(encrypted_extra)  # type:ignore
         except (json.JSONDecodeError, TypeError):
@@ -413,8 +411,8 @@ def mask_encrypted_extra(
 
     @classmethod
     def unmask_encrypted_extra(
-        cls, old: Union[str, None], new: Union[str, None]
-    ) -> Union[str, None]:
+        cls, old: Optional[str], new: Optional[str]
+    ) -> Optional[str]:
         """
         Reuse ``private_key`` if available and unchanged.
         """
diff --git a/superset/db_engine_specs/gsheets.py b/superset/db_engine_specs/gsheets.py
index 441413f005a0a..ae5b337cc0b62 100644
--- a/superset/db_engine_specs/gsheets.py
+++ b/superset/db_engine_specs/gsheets.py
@@ -17,7 +17,7 @@
 import json
 import re
 from contextlib import closing
-from typing import Any, Dict, List, Optional, Pattern, Tuple, TYPE_CHECKING, Union
+from typing import Any, Dict, List, Optional, Pattern, Tuple, TYPE_CHECKING
 
 from apispec import APISpec
 from apispec.ext.marshmallow import MarshmallowPlugin
@@ -138,9 +138,7 @@ def get_parameters_from_uri(
         raise ValidationError("Invalid service credentials")
 
     @classmethod
-    def mask_encrypted_extra(
-        cls, encrypted_extra: Union[str, None]
-    ) -> Union[str, None]:
+    def mask_encrypted_extra(cls, encrypted_extra: Optional[str]) -> Optional[str]:
         try:
             config = json.loads(encrypted_extra)  # type:ignore
         except (TypeError, json.JSONDecodeError):
@@ -155,8 +153,8 @@ def mask_encrypted_extra(
 
     @classmethod
     def unmask_encrypted_extra(
-        cls, old: Union[str, None], new: Union[str, None]
-    ) -> Union[str, None]:
+        cls, old: Optional[str], new: Optional[str]
+    ) -> Optional[str]:
         """
         Reuse ``private_key`` if available and unchanged.
         """
diff --git a/superset/models/core.py b/superset/models/core.py
index 3c5ecfdd8508c..0f4374236c5ef 100755
--- a/superset/models/core.py
+++ b/superset/models/core.py
@@ -24,7 +24,7 @@
 from contextlib import closing
 from copy import deepcopy
 from datetime import datetime
-from typing import Any, Callable, Dict, List, Optional, Set, Tuple, Type, Union
+from typing import Any, Callable, Dict, List, Optional, Set, Tuple, Type
 
 import numpy
 import pandas as pd
@@ -248,7 +248,7 @@ def backend(self) -> str:
         return sqlalchemy_url.get_backend_name()
 
     @property
-    def masked_encrypted_extra(self) -> Union[str, None]:
+    def masked_encrypted_extra(self) -> Optional[str]:
         return self.db_engine_spec.mask_encrypted_extra(self.encrypted_extra)
 
     @property
diff --git a/tests/unit_tests/db_engine_specs/test_bigquery.py b/tests/unit_tests/db_engine_specs/test_bigquery.py
index 0d8792cdf5972..e5664eaa299bb 100644
--- a/tests/unit_tests/db_engine_specs/test_bigquery.py
+++ b/tests/unit_tests/db_engine_specs/test_bigquery.py
@@ -234,7 +234,7 @@ def test_unmask_encrypted_extra_when_new_is_empty() -> None:
     )
     new = None
 
-    assert BigQueryEngineSpec.unmask_encrypted_extra(old, new) == None
+    assert BigQueryEngineSpec.unmask_encrypted_extra(old, new) is None
 
 
 def test_mask_encrypted_extra_when_empty() -> None:
@@ -243,4 +243,4 @@ def test_mask_encrypted_extra_when_empty() -> None:
     """
     from superset.db_engine_specs.bigquery import BigQueryEngineSpec
 
-    assert BigQueryEngineSpec.mask_encrypted_extra(None) == None
+    assert BigQueryEngineSpec.mask_encrypted_extra(None) is None
diff --git a/tests/unit_tests/db_engine_specs/test_gsheets.py b/tests/unit_tests/db_engine_specs/test_gsheets.py
index 773fe7130872d..0eb17ad865ec1 100644
--- a/tests/unit_tests/db_engine_specs/test_gsheets.py
+++ b/tests/unit_tests/db_engine_specs/test_gsheets.py
@@ -280,4 +280,4 @@ def test_unmask_encrypted_extra_when_new_is_none() -> None:
     )
     new = None
 
-    assert GSheetsEngineSpec.unmask_encrypted_extra(old, new) == None
+    assert GSheetsEngineSpec.unmask_encrypted_extra(old, new) is None