diff --git a/packages/evo-compute/src/evo/compute/tasks/geostatistics/conditioned_simulator.py b/packages/evo-compute/src/evo/compute/tasks/geostatistics/conditioned_simulator.py
index a53ad9872..2b66f7fe3 100644
--- a/packages/evo-compute/src/evo/compute/tasks/geostatistics/conditioned_simulator.py
+++ b/packages/evo-compute/src/evo/compute/tasks/geostatistics/conditioned_simulator.py
@@ -41,13 +41,13 @@
 
 from __future__ import annotations
 
-from typing import Any, ClassVar, Literal, Protocol, runtime_checkable
+from typing import ClassVar, Literal, Protocol, runtime_checkable
 
 import pandas as pd
 from evo.common import IContext, IFeedback
 from evo.objects import ObjectSchema
 from evo.objects.typed import BaseObject, object_from_reference
-from pydantic import BaseModel, Field, SerializerFunctionWrapHandler, field_validator, model_serializer
+from pydantic import BaseModel, Field, field_validator
 
 from ..common import (
     AttributeExpression,
@@ -103,14 +103,6 @@ class TailExtrapolationParams(BaseModel):
     upper: UpperTailParams
     lower: LowerTailParams | None = None
 
-    @model_serializer(mode="wrap")
-    def _serialize(self, handler: SerializerFunctionWrapHandler) -> dict[str, Any]:
-        result = handler(self)
-        # The service requires this key even when null; TaskRunner dumps with exclude_none=True.
-        if self.lower is None:
-            result["lower"] = None
-        return result
-
 
 class DistributionParams(BaseModel):
     """Parameters for the continuous distribution used for normal-score transformation."""
@@ -124,14 +116,6 @@ class DistributionParams(BaseModel):
     tail_extrapolation: TailExtrapolationParams | None = None
     """Optional tail extrapolation parameters."""
 
-    @model_serializer(mode="wrap")
-    def _serialize(self, handler: SerializerFunctionWrapHandler) -> dict[str, Any]:
-        result = handler(self)
-        # The service requires this key even when null; TaskRunner dumps with exclude_none=True.
-        if self.tail_extrapolation is None:
-            result["tail_extrapolation"] = None
-        return result
-
 
 class ConSimMaterialCategory(BaseModel):
     """Material category for loss calculation within simulation."""
diff --git a/packages/evo-compute/src/evo/compute/tasks/geostatistics/simulation_report.py b/packages/evo-compute/src/evo/compute/tasks/geostatistics/simulation_report.py
index 46d7ab0a7..580c20aa0 100644
--- a/packages/evo-compute/src/evo/compute/tasks/geostatistics/simulation_report.py
+++ b/packages/evo-compute/src/evo/compute/tasks/geostatistics/simulation_report.py
@@ -46,10 +46,10 @@
 
 from __future__ import annotations
 
-from typing import Any, ClassVar, Literal
+from typing import ClassVar, Literal
 
 from evo.common import IContext
-from pydantic import BaseModel, Field, SerializerFunctionWrapHandler, field_validator, model_serializer
+from pydantic import BaseModel, Field, field_validator
 
 from ..common import (
     AttributeExpression,
@@ -107,14 +107,6 @@ class SimulationReportDistribution(BaseModel):
     weights: AttributeExpression | None = None
     """Optional sample weights. Accepts a typed attribute or an attribute expression."""
 
-    @model_serializer(mode="wrap")
-    def _serialize(self, handler: SerializerFunctionWrapHandler) -> dict[str, Any]:
-        result = handler(self)
-        # The service requires this key even when null; TaskRunner dumps with exclude_none=True.
-        if self.tail_extrapolation is None:
-            result["tail_extrapolation"] = None
-        return result
-
 
 class SimReportContextItem(BaseModel):
     """Single key-value detail for a simulation report."""
diff --git a/packages/evo-compute/tests/geostatistics/test_conditioned_simulator_tasks.py b/packages/evo-compute/tests/geostatistics/test_conditioned_simulator_tasks.py
index a76608f1b..7fce228ce 100644
--- a/packages/evo-compute/tests/geostatistics/test_conditioned_simulator_tasks.py
+++ b/packages/evo-compute/tests/geostatistics/test_conditioned_simulator_tasks.py
@@ -176,20 +176,18 @@ def test_distribution_params(self):
         d = _dump(params)
         self.assertEqual(d["distribution"]["tail_extrapolation"]["upper"]["power"], 0.5)
 
-    def test_distribution_without_tail_extrapolation_sends_null(self):
+    def test_distribution_without_tail_extrapolation_omits_key(self):
         d = _dump(_params(distribution=DistributionParams(weights="declustering_weights")))
-        self.assertEqual(d["distribution"], {"weights": "declustering_weights", "tail_extrapolation": None})
+        self.assertEqual(d["distribution"], {"weights": "declustering_weights"})
 
-    def test_tail_extrapolation_without_lower_sends_null(self):
+    def test_tail_extrapolation_without_lower_omits_key(self):
         params = _params(
             distribution=DistributionParams(
                 tail_extrapolation=TailExtrapolationParams(upper=UpperTailParams(power=0.5, max=100.0)),
             ),
         )
         d = _dump(params)
-        self.assertEqual(
-            d["distribution"]["tail_extrapolation"], {"upper": {"power": 0.5, "max": 100.0}, "lower": None}
-        )
+        self.assertEqual(d["distribution"]["tail_extrapolation"], {"upper": {"power": 0.5, "max": 100.0}})
 
     def test_tail_extrapolation_with_lower(self):
         params = _params(
diff --git a/packages/evo-compute/tests/geostatistics/test_simulation_report_tasks.py b/packages/evo-compute/tests/geostatistics/test_simulation_report_tasks.py
index d129e2962..29f017b38 100644
--- a/packages/evo-compute/tests/geostatistics/test_simulation_report_tasks.py
+++ b/packages/evo-compute/tests/geostatistics/test_simulation_report_tasks.py
@@ -180,16 +180,14 @@ def test_distribution_with_weights(self):
         d = _dump(_params(distribution=SimulationReportDistribution(weights="declustering_weights")))
         self.assertEqual(d["distribution"]["weights"], "declustering_weights")
 
-    def test_distribution_without_tail_extrapolation_sends_null(self):
+    def test_distribution_without_tail_extrapolation_omits_key(self):
         d = _dump(_params(distribution=SimulationReportDistribution(weights="declustering_weights")))
-        self.assertEqual(d["distribution"], {"weights": "declustering_weights", "tail_extrapolation": None})
+        self.assertEqual(d["distribution"], {"weights": "declustering_weights"})
 
     def test_distribution_with_tail_extrapolation(self):
         tail = TailExtrapolationParams(upper=UpperTailParams(power=0.5, max=100.0))
         d = _dump(_params(distribution=SimulationReportDistribution(tail_extrapolation=tail)))
-        self.assertEqual(
-            d["distribution"]["tail_extrapolation"], {"upper": {"power": 0.5, "max": 100.0}, "lower": None}
-        )
+        self.assertEqual(d["distribution"]["tail_extrapolation"], {"upper": {"power": 0.5, "max": 100.0}})
 
     def test_report_context(self):
         d = _dump(
diff --git a/uv.lock b/uv.lock
index cc72d803b..b14423b38 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1409,7 +1409,7 @@ test = [
 
 [[package]]
 name = "evo-widgets"
-version = "0.2.2"
+version = "0.2.3"
 source = { editable = "packages/evo-widgets" }
 dependencies = [
     { name = "evo-sdk-common" },