diff --git a/libs/labelbox/src/labelbox/schema/workflow/nodes/done_node.py b/libs/labelbox/src/labelbox/schema/workflow/nodes/done_node.py
index fce1d3bd6..2c2e2c3cc 100644
--- a/libs/labelbox/src/labelbox/schema/workflow/nodes/done_node.py
+++ b/libs/labelbox/src/labelbox/schema/workflow/nodes/done_node.py
@@ -2,7 +2,7 @@
 
 import logging
 from typing import Dict, List, Any, Optional
-from pydantic import Field, field_validator
+from pydantic import Field, field_validator, ConfigDict
 
 from labelbox.schema.workflow.base import BaseWorkflowNode
 from labelbox.schema.workflow.enums import (
@@ -57,6 +57,8 @@ class DoneNode(BaseWorkflowNode):
         and will not flow to any other nodes in the workflow.
     """
 
+    model_config = ConfigDict(extra="ignore")
+
     label: str = Field(default="Done", max_length=50)
     definition_id: WorkflowDefinitionId = Field(
         default=WorkflowDefinitionId.Done, frozen=True, alias="definitionId"
diff --git a/libs/labelbox/src/labelbox/schema/workflow/nodes/initial_labeling_node.py b/libs/labelbox/src/labelbox/schema/workflow/nodes/initial_labeling_node.py
index 1adff2e2b..5de2af0d6 100644
--- a/libs/labelbox/src/labelbox/schema/workflow/nodes/initial_labeling_node.py
+++ b/libs/labelbox/src/labelbox/schema/workflow/nodes/initial_labeling_node.py
@@ -2,7 +2,7 @@
 
 import logging
 from typing import Dict, List, Any, Optional, Literal, Union
-from pydantic import Field, field_validator, model_validator
+from pydantic import Field, field_validator, model_validator, ConfigDict
 
 from labelbox.schema.workflow.base import BaseWorkflowNode
 from labelbox.schema.workflow.enums import (
@@ -59,6 +59,8 @@ class InitialLabelingNode(BaseWorkflowNode):
         and cannot have incoming connections from other nodes.
     """
 
+    model_config = ConfigDict(extra="ignore")
+
     label: str = Field(
         default="Initial labeling task", frozen=True, max_length=50
     )
diff --git a/libs/labelbox/src/labelbox/schema/workflow/nodes/initial_rework_node.py b/libs/labelbox/src/labelbox/schema/workflow/nodes/initial_rework_node.py
index fca96aeb0..fb86f8e80 100644
--- a/libs/labelbox/src/labelbox/schema/workflow/nodes/initial_rework_node.py
+++ b/libs/labelbox/src/labelbox/schema/workflow/nodes/initial_rework_node.py
@@ -2,7 +2,7 @@
 
 import logging
 from typing import Dict, List, Any, Optional, Literal, Union
-from pydantic import Field, field_validator, model_validator
+from pydantic import Field, field_validator, model_validator, ConfigDict
 
 from labelbox.schema.workflow.base import BaseWorkflowNode
 from labelbox.schema.workflow.enums import (
@@ -66,6 +66,8 @@ class InitialReworkNode(BaseWorkflowNode):
         to ensure proper routing in the Labelbox platform.
     """
 
+    model_config = ConfigDict(extra="ignore")
+
     label: str = Field(
         default="Rework (all rejected)", frozen=True, max_length=50
     )
diff --git a/libs/labelbox/src/labelbox/schema/workflow/nodes/logic_node.py b/libs/labelbox/src/labelbox/schema/workflow/nodes/logic_node.py
index 1457a7227..6b53437cb 100644
--- a/libs/labelbox/src/labelbox/schema/workflow/nodes/logic_node.py
+++ b/libs/labelbox/src/labelbox/schema/workflow/nodes/logic_node.py
@@ -6,7 +6,7 @@
 
 import logging
 from typing import Dict, List, Any, Optional, Literal
-from pydantic import Field, model_validator, field_validator
+from pydantic import Field, model_validator, field_validator, ConfigDict
 
 from labelbox.schema.workflow.base import BaseWorkflowNode
 from labelbox.schema.workflow.enums import (
@@ -27,6 +27,7 @@
 
 
 class LogicNode(BaseWorkflowNode):
+    model_config = ConfigDict(extra="ignore")
     """Logic node. One or more instances possible. One input, two outputs (if/else)."""
 
     label: str = Field(
diff --git a/libs/labelbox/src/labelbox/schema/workflow/nodes/review_node.py b/libs/labelbox/src/labelbox/schema/workflow/nodes/review_node.py
index 4c51d38c0..3f1861cf1 100644
--- a/libs/labelbox/src/labelbox/schema/workflow/nodes/review_node.py
+++ b/libs/labelbox/src/labelbox/schema/workflow/nodes/review_node.py
@@ -2,7 +2,7 @@
 
 import logging
 from typing import Dict, List, Any, Optional, Literal, Union
-from pydantic import Field, field_validator, model_validator
+from pydantic import Field, field_validator, model_validator, ConfigDict
 
 from labelbox.schema.workflow.base import BaseWorkflowNode
 from labelbox.schema.workflow.enums import (
@@ -69,6 +69,8 @@ class ReviewNode(BaseWorkflowNode):
         which default to "and" logic. This allows more flexible routing.
     """
 
+    model_config = ConfigDict(extra="ignore")
+
     label: str = Field(default="Review task", max_length=50)
     # For ReviewNode, filter_logic defaults to "or"
     filter_logic: Literal["and", "or"] = Field(
diff --git a/libs/labelbox/src/labelbox/schema/workflow/nodes/rework_node.py b/libs/labelbox/src/labelbox/schema/workflow/nodes/rework_node.py
index 079e4b434..5e6ddf5e8 100644
--- a/libs/labelbox/src/labelbox/schema/workflow/nodes/rework_node.py
+++ b/libs/labelbox/src/labelbox/schema/workflow/nodes/rework_node.py
@@ -2,7 +2,7 @@
 
 import logging
 from typing import Dict, List, Any, Optional, Literal
-from pydantic import Field, field_validator
+from pydantic import Field, field_validator, ConfigDict
 
 from labelbox.schema.workflow.base import BaseWorkflowNode
 from labelbox.schema.workflow.enums import (
@@ -17,6 +17,7 @@
 
 
 class ReworkNode(BaseWorkflowNode):
+    model_config = ConfigDict(extra="ignore")
     """
     Terminal rework node for sending work back for corrections.
 
diff --git a/libs/labelbox/src/labelbox/schema/workflow/workflow.py b/libs/labelbox/src/labelbox/schema/workflow/workflow.py
index 4af0f9e25..55682ff58 100644
--- a/libs/labelbox/src/labelbox/schema/workflow/workflow.py
+++ b/libs/labelbox/src/labelbox/schema/workflow/workflow.py
@@ -283,10 +283,13 @@ def get_nodes(self) -> List[BaseWorkflowNode]:
                     node_kwargs["config"] = node_data["config"]
 
                 if "customFields" in node_data:
-                    node_kwargs["customFields"] = node_data["customFields"]
+                    # Handle customFields being None by converting to empty dict
+                    custom_fields = node_data["customFields"]
+                    if custom_fields is None:
+                        custom_fields = {}
+                    node_kwargs["customFields"] = custom_fields
 
                     # Extract instructions from customFields if available
-                    custom_fields = node_data["customFields"]
                     if (
                         isinstance(custom_fields, dict)
                         and "description" in custom_fields