diff --git a/Makefile b/Makefile
index 03acdd5d2d9db804bda7d770c90608d3394e9ff1..bdb7df47f973685453838f5838de9b788f0e7c46 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 BASE=ordernumbers
 PLATTFORM=woocommerce
 VENDOR=opentools
-VERSION=1.3.9
+VERSION=1.4.0
 DIR = $(shell pwd)
 SVNDIR=wordpress-plugin-svn
 
diff --git a/readme.txt b/readme.txt
index 70941744c9f61e9ff09a6650dd0eb75185d3d255..e3c2440019be9938fc01a92c15a55c05ac69ae10 100644
--- a/readme.txt
+++ b/readme.txt
@@ -4,7 +4,7 @@ Contributors: opentools
 Tags: WooCommerce, Order numbers, orders
 Requires at least: 4.0
 Tested up to: 4.7
-Stable tag: 1.3.9
+Stable tag: 1.4.0
 License: GPLv3 or later
 License URI: http://www.gnu.org/licenses/gpl.html
 
@@ -78,6 +78,8 @@ The Advanced Ordernumbers for WooCommerce plugin supports some invoicing plugins
 
 == Changelog ==
 
+= 1.4.0 =
+
 = 1.3.9 =
 * Fix issues with the WooCommerce PDF Invoices & Packaging Slips plugin (invoice numbers were created even if disabled and before an invoice was actually generated)
 
diff --git a/woocommerce-advanced-ordernumbers.php b/woocommerce-advanced-ordernumbers.php
index 8cfd41551addf743f2cae248c74fec4adde043b9..383350756636d4b638ef1fd3e2f626a1a45efee4 100644
--- a/woocommerce-advanced-ordernumbers.php
+++ b/woocommerce-advanced-ordernumbers.php
@@ -3,7 +3,7 @@
  * Plugin Name: Woocommerce Advanced Ordernumbers
  * Plugin URI: http://open-tools.net/woocommerce/advanced-ordernumbers-for-woocommerce.html
  * Description: Lets the user freely configure the order numbers in WooCommerce.
- * Version: 1.3.9
+ * Version: 1.4.0
  * Author: Open Tools
  * Author URI: http://open-tools.net
  * Text Domain: woocommerce-advanced-ordernumbers
diff --git a/woocommerce-basic-ordernumbers.php b/woocommerce-basic-ordernumbers.php
index 4345d19c2564422e7e92e12d02b0d5163fcfce50..ff128ac66f1bf12a15edd67477664624993feef0 100644
--- a/woocommerce-basic-ordernumbers.php
+++ b/woocommerce-basic-ordernumbers.php
@@ -3,7 +3,7 @@
  * Plugin Name: WooCommerce Basic Ordernumbers
  * Plugin URI: http://open-tools.net/woocommerce/advanced-ordernumbers-for-woocommerce.html
  * Description: Configure WooCommerce ordernumbers to have a running counter and arbitrary, fixed text (prefix / postfix).
- * Version: 1.3.9
+ * Version: 1.4.0
  * Author: Open Tools
  * Author URI: http://open-tools.net
  * Text Domain: woocommerce-advanced-ordernumbers