diff --git a/api/orchestration.go b/api/orchestration.go
index 5e78cf9..e707105 100644
--- a/api/orchestration.go
+++ b/api/orchestration.go
@@ -198,8 +198,9 @@ func WithRerunInput(input any) RerunOptions {
 	}
 }
 
-// protoMarshaler uses UseProtoNames so JSON output uses snake_case field names.
-var protoMarshaler = protojson.MarshalOptions{UseProtoNames: true}
+// protoMarshaler uses default protojson options so JSON output uses camelCase
+// field names (the protojson default).
+var protoMarshaler = protojson.MarshalOptions{}
 
 // marshalData serializes v to JSON. Proto message types use protojson for
 // correct handling of well-known types (e.g. google.protobuf.Struct);
diff --git a/task/executor.go b/task/executor.go
index c40ff41..0d79cbf 100644
--- a/task/executor.go
+++ b/task/executor.go
@@ -187,9 +187,9 @@ func (te taskExecutor) Shutdown(ctx context.Context) error {
 	return nil
 }
 
-// protoMarshaler uses UseProtoNames so JSON output uses snake_case field names
-// (matching the proto field names), which is the convention for workflow payloads.
-var protoMarshaler = protojson.MarshalOptions{UseProtoNames: true}
+// protoMarshaler uses default protojson options so JSON output uses camelCase
+// field names (the protojson default).
+var protoMarshaler = protojson.MarshalOptions{}
 
 func unmarshalData(data []byte, v any) error {
 	if v == nil {