diff --git a/types/json2csv/JSON2CSVBase.d.ts b/types/json2csv/JSON2CSVBase.d.ts
index d65a3cc297..c5f328db1f 100644
--- a/types/json2csv/JSON2CSVBase.d.ts
+++ b/types/json2csv/JSON2CSVBase.d.ts
@@ -13,6 +13,7 @@ export declare namespace json2csv {
         fields?: Array<string | FieldInfo<T>>;
         ndjson?: boolean;
         unwind?: string | Array<string>;
+        unwindBlank?: boolean;
         flatten?: boolean;
         defaultValue?: string;
         quote?: string;
diff --git a/types/json2csv/index.d.ts b/types/json2csv/index.d.ts
index 159dec6eb1..55a1829625 100644
--- a/types/json2csv/index.d.ts
+++ b/types/json2csv/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for json2csv 4.0
+// Type definitions for json2csv 4.1
 // Project: https://github.com/zemirco/json2csv
 // Definitions by: Juanjo Diaz <https://github.com/juanjoDiaz>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped