diff --git a/docx-wasm/js/json/styles.ts b/docx-wasm/js/json/styles.ts
index 962d46d..a601c32 100644
--- a/docx-wasm/js/json/styles.ts
+++ b/docx-wasm/js/json/styles.ts
@@ -14,6 +14,7 @@ export type StyleJSON = {
   tableCellProperty: TableCellPropertyJSON;
   basedOn: string | null;
   link?: string | null | undefined;
+  next?: string | null;
 };
 
 export type StylesJSON = {
diff --git a/docx-wasm/js/json/table.ts b/docx-wasm/js/json/table.ts
index 73d00c0..5b4db3a 100644
--- a/docx-wasm/js/json/table.ts
+++ b/docx-wasm/js/json/table.ts
@@ -78,7 +78,7 @@ export type TablePropertyJSON = {
     insideH?: BorderJSON | null;
     insideV?: BorderJSON | null;
   } | null;
-  margins: TableCellMarginsJSON | null;
+  margins?: TableCellMarginsJSON | null;
   indent?: {
     width: number;
     widthType: WidthType;