diff --git a/CHANGELOG.md b/CHANGELOG.md
index c491c58..55bc740 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## docx-wasm@0.0.278-rc15 (23. Jun, 2023)
+
+- Make docGrid Optional in sectionProperty
+
 ## docx-wasm@0.0.278-rc14 (23. Jun, 2023)
 
 - Support character spacing in run property
diff --git a/docx-wasm/js/json/section-property.ts b/docx-wasm/js/json/section-property.ts
index a1f0726..69e9e35 100644
--- a/docx-wasm/js/json/section-property.ts
+++ b/docx-wasm/js/json/section-property.ts
@@ -21,5 +21,5 @@ export type SectionPropertyJSON = {
     gutter: number;
   };
   columns: number;
-  docGrid: DocGridJSON;
+  docGrid?: DocGridJSON;
 };
diff --git a/docx-wasm/package.json b/docx-wasm/package.json
index 096822b..ea02958 100644
--- a/docx-wasm/package.json
+++ b/docx-wasm/package.json
@@ -1,6 +1,6 @@
 {
   "name": "docx-wasm",
-  "version": "0.0.278-rc14",
+  "version": "0.0.278-rc15",
   "main": "dist/node/index.js",
   "browser": "dist/web/index.js",
   "author": "bokuweb <bokuweb12@gmail.com>",