diff --git a/stix2/test/v20/test_versioning.py b/stix2/test/v20/test_versioning.py
index 9d9d797..03d43cc 100644
--- a/stix2/test/v20/test_versioning.py
+++ b/stix2/test/v20/test_versioning.py
@@ -2,6 +2,7 @@ import pytest
 
 import stix2
 import stix2.exceptions
+import stix2.utils
 import stix2.v20
 import stix2.versioning
 
diff --git a/stix2/versioning.py b/stix2/versioning.py
index 1b9ba1c..7ec7250 100644
--- a/stix2/versioning.py
+++ b/stix2/versioning.py
@@ -1,11 +1,12 @@
 import copy
 import datetime as dt
-from stix2.utils import (
-    get_timestamp, parse_into_datetime
-)
-import stix2.base
-import stix2.v20.base
+
 from six.moves.collections_abc import Mapping
+
+import stix2.base
+from stix2.utils import get_timestamp, parse_into_datetime
+import stix2.v20.base
+
 from .exceptions import (
     InvalidValueError, RevokeError, UnmodifiablePropertyError,
 )