diff --git a/src/backend/InvenTree/InvenTree/api_version.py b/src/backend/InvenTree/InvenTree/api_version.py
index ea7d6f4a83..260eb57f91 100644
--- a/src/backend/InvenTree/InvenTree/api_version.py
+++ b/src/backend/InvenTree/InvenTree/api_version.py
@@ -1,11 +1,15 @@
 """InvenTree API version information."""
 
 # InvenTree API version
-INVENTREE_API_VERSION = 572
+INVENTREE_API_VERSION = 573
 """Increment this API version number whenever there is a significant change to the API that any clients need to know about."""
 
 INVENTREE_API_TEXT = """
 
+v573 -> 2026-11-07 : https://github.com/inventree/InvenTree/pull/13221
+    - Mark audit log changes_detail field as nullable
+    - Add warning field to ApiToken
+
 v572 -> 2026-11-07 : https://github.com/inventree/InvenTree/pull/13212
     - Username and email fields on the /api/user/me endpoint are now read-only
 
diff --git a/src/backend/InvenTree/audit/serializers.py b/src/backend/InvenTree/audit/serializers.py
index 6e41f62c2f..c2efeca667 100644
--- a/src/backend/InvenTree/audit/serializers.py
+++ b/src/backend/InvenTree/audit/serializers.py
@@ -159,7 +159,11 @@ class AuditLogEntrySerializer(
 
     changes_detail = OptionalField(
         serializer_class=serializers.SerializerMethodField,
-        serializer_kwargs={'read_only': True, 'label': _('Change Details')},
+        serializer_kwargs={
+            'read_only': True,
+            'allow_null': True,
+            'label': _('Change Details'),
+        },
         default_include=False,
     )
 
diff --git a/src/backend/InvenTree/users/serializers.py b/src/backend/InvenTree/users/serializers.py
index b03af9a106..0efa5af89a 100644
--- a/src/backend/InvenTree/users/serializers.py
+++ b/src/backend/InvenTree/users/serializers.py
@@ -266,6 +266,7 @@ class ApiTokenSerializer(InvenTreeModelSerializer):
             'issued_by_detail',
             'token_version',
             'revocation_reason',
+            'warning',
         ]
         read_only_fields = [
             'last_seen',
@@ -274,6 +275,7 @@ class ApiTokenSerializer(InvenTreeModelSerializer):
             'issued_by',
             'token_version',
             'revocation_reason',
+            'warning',
         ]
 
     def validate_expiry(self, expiry):
@@ -314,6 +316,7 @@ class ApiTokenSerializer(InvenTreeModelSerializer):
     issued_by_detail = UserSerializer(
         source='issued_by', read_only=True, allow_null=True
     )
+    warning = serializers.CharField(read_only=True, allow_null=True)
 
 
 class GroupSerializer(FilterableSerializerMixin, InvenTreeModelSerializer):