diff --git a/CHANGELOG.md b/CHANGELOG.md
index b917a6f..865bb3f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,12 @@
+## [2.9.1](https://github.com/mengxiong10/vue2-datepicker/compare/v2.9.0...v2.9.1) (2019-02-01)
+
+
+### Bug Fixes
+
+* stringify function returns a error value,when date is null ([#244](https://github.com/mengxiong10/vue2-datepicker/issues/244)) ([92243ab](https://github.com/mengxiong10/vue2-datepicker/commit/92243ab))
+
+
+
 # [2.9.0](https://github.com/mengxiong10/vue2-datepicker/compare/v2.8.1...v2.9.0) (2019-01-29)
 
 
diff --git a/package-lock.json b/package-lock.json
index acbd627..6c49c22 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "vue2-datepicker",
-  "version": "2.9.0",
+  "version": "2.9.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 2cc3b65..4964810 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
     "lib",
     "src"
   ],
-  "version": "2.9.0",
+  "version": "2.9.1",
   "scripts": {
     "dev": "cross-env NODE_ENV=development webpack-dev-server --hot --open --config build/webpack.dev.config.js",
     "demo": "cross-env NODE_ENV=production webpack --progress --hide-modules --config build/webpack.demo.config.js",