diff --git a/CHANGELOG b/CHANGELOG
index e01334f67..be701ef52 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,7 @@
+* 1.23.4 (2016-XX-XX)
+
+ * n/a
+
 * 1.23.3 (2016-01-11)
 
  * fixed typo
diff --git a/ext/twig/php_twig.h b/ext/twig/php_twig.h
index c4932bb18..bd9b1ee96 100644
--- a/ext/twig/php_twig.h
+++ b/ext/twig/php_twig.h
@@ -15,7 +15,7 @@
 #ifndef PHP_TWIG_H
 #define PHP_TWIG_H
 
-#define PHP_TWIG_VERSION "1.23.3"
+#define PHP_TWIG_VERSION "1.23.4-DEV"
 
 #include "php.h"
 
diff --git a/lib/Twig/Environment.php b/lib/Twig/Environment.php
index ec8d3e9b0..e57f5de03 100644
--- a/lib/Twig/Environment.php
+++ b/lib/Twig/Environment.php
@@ -16,7 +16,7 @@
  */
 class Twig_Environment
 {
-    const VERSION = '1.23.3';
+    const VERSION = '1.23.4-DEV';
 
     protected $charset;
     protected $loader;