diff --git a/incident-ef7/src/incident/event.py b/incident-ef7/src/incident/event.py
index 4fa8a92..eb88afe 100644
--- a/incident-ef7/src/incident/event.py
+++ b/incident-ef7/src/incident/event.py
@@ -1,11 +1,10 @@
 from collections import OrderedDict
 
 import stix2
-from stix2.exceptions import ObjectConfigurationError
-from stix2.properties import (BooleanProperty, EnumProperty, ListProperty,
-                              OpenVocabProperty, ReferenceProperty,
-                              StringProperty, TimestampProperty)
-from stix2.v21.base import _STIXBase21
+from stix2.properties import (BooleanProperty, EnumProperty, EmbeddedObjectProperty,
+                              IntegerProperty, ListProperty, OpenVocabProperty,
+                              ReferenceProperty, StringProperty,
+                              TimestampProperty)
 
 import incident.vocab as vocab
 from incident.common import StateChange
@@ -29,7 +28,7 @@ class EventEntry(_STIXBase21):
         # required properties
         ('event_ref', ReferenceProperty(valid_types='event', required=True)),
         # optional properties
-        ('next_steps', ListProperty(EventSequenceEntry)),
+        ('next_steps', ListProperty(EmbeddedObjectProperty(EventSequenceEntry))),
         ('sequence_start', BooleanProperty(default=lambda: True))
     ])
 
@@ -40,7 +39,7 @@ class EventEntry(_STIXBase21):
         # required properties
         ('status', EnumProperty(vocab.EVENT_STATUS, required=True)),
         # optional properties
-        ('changed_objects', ListProperty(StateChange)),
+        ('changed_objects', ListProperty(EmbeddedObjectProperty(StateChange))),
         ('description', StringProperty()),
         ('end_time', TimestampProperty()),
         ('end_time_fidelity', EnumProperty(vocab.TIMESTAMP_FIDELITY)),
@@ -50,7 +49,7 @@ class EventEntry(_STIXBase21):
         ('sighting_refs', ListProperty(ReferenceProperty(valid_types='sighting'))),
         ('start_time', TimestampProperty()),
         ('start_time_fidelity', EnumProperty(vocab.TIMESTAMP_FIDELITY)),
-        ('subevents', ListProperty(EventEntry)),
+        ('subevents', ListProperty(EmbeddedObjectProperty(EventEntry))),
     ],
     EVENT_EXTENSION_DEFINITION_ID
 )
diff --git a/incident-ef7/src/incident/incident.py b/incident-ef7/src/incident/incident.py
index 91f2d44..e02a8ca 100644
--- a/incident-ef7/src/incident/incident.py
+++ b/incident-ef7/src/incident/incident.py
@@ -1,7 +1,7 @@
 from collections import OrderedDict
 
 import stix2
-from stix2.properties import (EnumProperty, FloatProperty, IntegerProperty,
+from stix2.properties import (EmbeddedObjectProperty, EnumProperty, FloatProperty, IntegerProperty,
                               ListProperty, OpenVocabProperty,
                               ReferenceProperty, StringProperty)
 from stix2.v21.base import _STIXBase21
@@ -32,13 +32,13 @@ class IncidentScore(_STIXBase21):
         # optional properties
         ('criticality', IntegerProperty(min=0, max=100)),
         ('detection_methods', ListProperty(OpenVocabProperty(vocab.DETECTION_METHODS))),
-        ('events', ListProperty(EventEntry)),
+        ('events', ListProperty(EmbeddedObjectProperty(EventEntry))),
         ('impact_refs', ListProperty(ReferenceProperty(valid_types='impact'))),
         ('impacted_entity_counts', EntityCountProperty(spec_version='2.1')),
         ('incident_types', ListProperty(OpenVocabProperty(vocab.EVENT_TYPE))),
         ('recoverability', EnumProperty(vocab.RECOVERABILITY)),
-        ('scores', ListProperty(IncidentScore)),
-        ('tasks', ListProperty(TaskEntry)),
+        ('scores', ListProperty(EmbeddedObjectProperty(IncidentScore))),
+        ('tasks', ListProperty(EmbeddedObjectProperty(TaskEntry))),
     ],
 )
 class IncidentExtension:
diff --git a/incident-ef7/src/incident/task.py b/incident-ef7/src/incident/task.py
index 1e1c268..921526e 100644
--- a/incident-ef7/src/incident/task.py
+++ b/incident-ef7/src/incident/task.py
@@ -2,8 +2,8 @@
 
 import stix2
 from stix2.exceptions import ObjectConfigurationError
-from stix2.properties import (BooleanProperty, EnumProperty, IntegerProperty,
-                              ListProperty, OpenVocabProperty,
+from stix2.properties import (BooleanProperty, EnumProperty, EmbeddedObjectProperty,
+                              IntegerProperty, ListProperty, OpenVocabProperty,
                               ReferenceProperty, StringProperty,
                               TimestampProperty)
 from stix2.v21 import _STIXBase21
@@ -30,7 +30,7 @@ class TaskEntry(_STIXBase21):
         # required properties
         ('task_ref', ReferenceProperty(valid_types='task', required=True)),
         # optional properties
-        ('next_steps', ListProperty(TaskSequenceEntry)),
+        ('next_steps', ListProperty(EmbeddedObjectProperty(TaskSequenceEntry))),
         ('sequence_start', BooleanProperty(default=lambda: True))
     ])
 
@@ -41,7 +41,7 @@ class TaskEntry(_STIXBase21):
         # required properties
         ('outcome', EnumProperty(vocab.TASK_OUTCOME, required=True)),
         # optional properties
-        ('changed_objects', ListProperty(StateChange)),
+        ('changed_objects', ListProperty(EmbeddedObjectProperty(StateChange))),
         ('task_types', ListProperty(OpenVocabProperty(vocab.TASK_TYPE))),
         ('description', StringProperty()),
         ('end_time', TimestampProperty()),
@@ -52,7 +52,7 @@ class TaskEntry(_STIXBase21):
         ('priority', IntegerProperty(min=0, max=100)),
         ('start_time', TimestampProperty()),
         ('start_time_fidelity', EnumProperty(vocab.TIMESTAMP_FIDELITY)),
-        ('subtasks', ListProperty(TaskEntry))
+        ('subtasks', ListProperty(EmbeddedObjectProperty(TaskEntry)))
     ],
     TASK_EXTENSION_DEFINITION_ID
 )