diff --git a/python/understack-workflows/tests/test_sync_interfaces.py b/python/understack-workflows/tests/test_sync_interfaces.py
new file mode 100644
index 000000000..efbd67f9c
--- /dev/null
+++ b/python/understack-workflows/tests/test_sync_interfaces.py
@@ -0,0 +1,80 @@
+from unittest.mock import Mock
+
+from understack_workflows import sync_interfaces
+
+
+def test_sync_with_no_existing_interfaces(dell_nautobot_device):
+    ironic_client = Mock()
+    ironic_client.list_ports.return_value = []
+
+    sync_interfaces.from_nautobot_to_ironic(
+        pxe_interface="",
+        nautobot_device=dell_nautobot_device,
+        ironic_client=ironic_client,
+    )
+
+    assert ironic_client.create_port.call_count == 4
+
+    ironic_client.create_port.assert_any_call(
+        {
+            "address": "14:23:f3:f5:25:f1",
+            "uuid": "8c28941c-02cd-4aad-9e3f-93c39e08b58a",
+            "node_uuid": "a3a2983f-d906-4663-943c-c41ab73c9b62",
+            "name": "8c28941c-02cd-4aad-9e3f-93c39e08b58a NIC.Slot.1-2",
+            "pxe_enabled": False,
+            "local_link_connection": {
+                "switch_id": "9c:54:16:f5:ad:27",
+                "port_id": "c210be75-1038-4ba3-9923-60050e1c5362",
+                "switch_info": "f20-2-1.iad3.rackspace.net",
+            },
+            "physical_network": "F20-2[1-2]",
+        }
+    )
+
+    ironic_client.create_port.assert_any_call(
+        {
+            "address": "d4:04:e6:4f:8d:b5",
+            "uuid": "39d98f09-3199-40e0-87dc-e5ed6dce78e5",
+            "node_uuid": "a3a2983f-d906-4663-943c-c41ab73c9b62",
+            "name": "39d98f09-3199-40e0-87dc-e5ed6dce78e5 NIC.Integrated.1-2",
+            "pxe_enabled": False,
+            "local_link_connection": {
+                "switch_id": "9c:54:16:f5:ac:27",
+                "port_id": "2148cf50-f70e-42c9-9f68-8ce98d61498c",
+                "switch_info": "f20-2-2.iad3.rackspace.net",
+            },
+            "physical_network": "F20-2[1-2]",
+        }
+    )
+
+    ironic_client.create_port.assert_any_call(
+        {
+            "address": "14:23:f3:f5:25:f0",
+            "uuid": "7ac587c4-015b-4a0e-b579-91284cbd0406",
+            "node_uuid": "a3a2983f-d906-4663-943c-c41ab73c9b62",
+            "name": "7ac587c4-015b-4a0e-b579-91284cbd0406 NIC.Slot.1-1",
+            "pxe_enabled": False,
+            "local_link_connection": {
+                "switch_id": "9c:54:16:f5:ad:27",
+                "port_id": "f72bb830-3f3c-4aba-b7d5-9680ea4d358e",
+                "switch_info": "f20-2-2.iad3.rackspace.net",
+            },
+            "physical_network": "F20-2[1-2]",
+        }
+    )
+
+    ironic_client.create_port.assert_any_call(
+        {
+            "address": "d4:04:e6:4f:8d:b4",
+            "uuid": "ac2f1eae-188e-4fc6-9245-f9a6cf8b4ea8",
+            "node_uuid": "a3a2983f-d906-4663-943c-c41ab73c9b62",
+            "name": "ac2f1eae-188e-4fc6-9245-f9a6cf8b4ea8 NIC.Integrated.1-1",
+            "pxe_enabled": False,
+            "local_link_connection": {
+                "switch_id": "9c:54:16:f5:ab:27",
+                "port_id": "f9a5cc87-d10a-4827-99e8-48961fd1d773",
+                "switch_info": "f20-2-1.iad3.rackspace.net",
+            },
+            "physical_network": "F20-2[1-2]",
+        }
+    )
diff --git a/python/understack-workflows/understack_workflows/sync_interfaces.py b/python/understack-workflows/understack_workflows/sync_interfaces.py
index d51d0658b..2a8880887 100644
--- a/python/understack-workflows/understack_workflows/sync_interfaces.py
+++ b/python/understack-workflows/understack_workflows/sync_interfaces.py
@@ -47,7 +47,7 @@ def from_nautobot_to_ironic(
                 logger.debug("No changes required for Ironic Port %s", port_id)
         else:
             logger.info("Creating Ironic Port %s ...", nb_port)
-            response = ironic_client.create_port(nb_port.dict())
+            response = ironic_client.create_port(nb_port.model_dump())
             logger.debug("Created: %s", response)