diff --git a/configure.in b/configure.in
index 40130626cb9f9..7e444b0ac4a03 100644
--- a/configure.in
+++ b/configure.in
@@ -119,7 +119,7 @@ int zend_sprintf(char *buffer, const char *format, ...);
 
 PHP_MAJOR_VERSION=5
 PHP_MINOR_VERSION=5
-PHP_RELEASE_VERSION=5
+PHP_RELEASE_VERSION=6
 PHP_EXTRA_VERSION="-dev"
 PHP_VERSION="$PHP_MAJOR_VERSION.$PHP_MINOR_VERSION.$PHP_RELEASE_VERSION$PHP_EXTRA_VERSION"
 PHP_VERSION_ID=`expr [$]PHP_MAJOR_VERSION \* 10000 + [$]PHP_MINOR_VERSION \* 100 + [$]PHP_RELEASE_VERSION`
diff --git a/main/php_version.h b/main/php_version.h
index d9ea4aab3cd61..2d98a3f80789a 100644
--- a/main/php_version.h
+++ b/main/php_version.h
@@ -2,7 +2,7 @@
 /* edit configure.in to change version number */
 #define PHP_MAJOR_VERSION 5
 #define PHP_MINOR_VERSION 5
-#define PHP_RELEASE_VERSION 5
+#define PHP_RELEASE_VERSION 6
 #define PHP_EXTRA_VERSION "-dev"
-#define PHP_VERSION "5.5.5-dev"
-#define PHP_VERSION_ID 50505
+#define PHP_VERSION "5.5.6-dev"
+#define PHP_VERSION_ID 50506