diff --git a/README.txt b/README.txt
index 0f73891c..f23d3033 100644
--- a/README.txt
+++ b/README.txt
@@ -3,7 +3,7 @@ Contributors: terrylin
 Tags: markdown, markdown editor, katex, mermaid, flow chart, github
 Requires at least: 4.0
 Tested up to: 5.4.0
-Stable tag: 1.13.0
+Stable tag: 1.13.1
 Requires PHP: 5.3.0
 License: GPLv3 or later
 License URI: https://www.gnu.org/licenses/gpl.html
@@ -339,6 +339,10 @@ GNU General Public License for more details.
 
 - New feature - MathJax.
 
+= 1.13.1
+
+- Bug fix - Missing property in Markdown class.
+
 == Upgrade Notice ==
 
 = Currently no logs now.
diff --git a/githuber-md.php b/githuber-md.php
index f173261b..db5dcd43 100644
--- a/githuber-md.php
+++ b/githuber-md.php
@@ -7,14 +7,14 @@
  *
  * @package Githuber
  * @since 1.0.0
- * @version 1.13.0
+ * @version 1.13.1
  */
 
 /**
  * Plugin Name: WP Githuber MD
  * Plugin URI:  https://github.com/terrylinooo/githuber-md
  * Description: An all-in-one Markdown plugin for your WordPress sites.
- * Version:     1.13.0
+ * Version:     1.13.1
  * Author:      Terry Lin
  * Author URI:  https://terryl.in/
  * License:     GPL 3.0
@@ -64,7 +64,7 @@
 define( 'GITHUBER_PLUGIN_URL', plugin_dir_url( __FILE__ ) );
 define( 'GITHUBER_PLUGIN_PATH', __FILE__ );
 define( 'GITHUBER_PLUGIN_LANGUAGE_PACK', dirname( plugin_basename( __FILE__ ) ) . '/languages' );
-define( 'GITHUBER_PLUGIN_VERSION', '1.13.0' );
+define( 'GITHUBER_PLUGIN_VERSION', '1.13.1' );
 define( 'GITHUBER_PLUGIN_TEXT_DOMAIN', 'wp-githuber-md' );
 
 /**
diff --git a/src/Githuber.php b/src/Githuber.php
index 4ca4203c..131d2418 100644
--- a/src/Githuber.php
+++ b/src/Githuber.php
@@ -7,7 +7,7 @@
  *
  * @package Githuber
  * @since 1.0.0
- * @version 1.13.0
+ * @version 1.13.1
  */
 
 use Githuber\Controller as Controller;