diff --git a/stix2/workbench.py b/stix2/workbench.py
index ff5d680..dcb72fd 100644
--- a/stix2/workbench.py
+++ b/stix2/workbench.py
@@ -21,7 +21,9 @@
 """
 
 import functools
+
 import stix2
+
 from . import AttackPattern as _AttackPattern
 from . import Campaign as _Campaign
 from . import CourseOfAction as _CourseOfAction
@@ -40,24 +42,25 @@ from . import Report as _Report
 from . import ThreatActor as _ThreatActor
 from . import Tool as _Tool
 from . import Vulnerability as _Vulnerability
-from . import (  # noqa: F401
+
+from . import (  # noqa: F401  isort:skip
     AlternateDataStream, ArchiveExt, Artifact, AutonomousSystem,
     Bundle, CustomExtension, CustomMarking, CustomObservable,
     Directory, DomainName, EmailAddress, EmailMessage,
     EmailMIMEComponent, Environment, ExternalReference, File,
     FileSystemSource, Filter, GranularMarking, HTTPRequestExt,
-    ICMPExt, IPv4Address, IPv6Address, KillChainPhase, LanguageContent, MACAddress,
-    MarkingDefinition, MemoryStore, Mutex, NetworkTraffic, NTFSExt,
-    parse_observable, PDFExt, Process, RasterImageExt, Relationship,
+    ICMPExt, IPv4Address, IPv6Address, KillChainPhase, LanguageContent,
+    MACAddress, MarkingDefinition, MemoryStore, Mutex, NetworkTraffic,
+    NTFSExt, parse_observable, PDFExt, Process, RasterImageExt, Relationship,
     Sighting, SocketExt, Software, StatementMarking,
     TAXIICollectionSource, TCPExt, TLP_AMBER, TLP_GREEN, TLP_RED,
     TLP_WHITE, TLPMarking, UNIXAccountExt, URL, UserAccount,
     WindowsPEBinaryExt, WindowsPEOptionalHeaderType,
     WindowsPESection, WindowsProcessExt, WindowsRegistryKey,
     WindowsRegistryValueType, WindowsServiceExt, X509Certificate,
-    X509V3ExtensionsType
+    X509V3ExtensionsType,
 )
-from .datastore.filters import FilterSet
+from .datastore.filters import FilterSet  # isort:skip
 
 
 # Enable some adaptation to the current default supported STIX version.