diff --git a/README.md b/README.md
index 7d99064e..500b5c3b 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ It is a port of [shadowsocks](https://github.com/shadowsocks/shadowsocks)
 created by [@clowwindy](https://github.com/clowwindy) maintained by 
 [@madeye](https://github.com/madeye) and [@linusyang](https://github.com/linusyang).
 
-Current version: 2.3.3 | [Changelog](debian/changelog)
+Current version: 2.4.0 | [Changelog](debian/changelog)
 
 Travis CI: [![Travis CI](https://travis-ci.org/shadowsocks/shadowsocks-libev.png?branch=master)](https://travis-ci.org/shadowsocks/shadowsocks-libev) | Jenkins Matrix: [![Jenkins](https://jenkins.shadowvpn.org/buildStatus/icon?job=Shadowsocks-libev)](https://jenkins.shadowvpn.org/job/Shadowsocks-libev/)
 
diff --git a/configure.ac b/configure.ac
index 1c5be3c4..2c136df9 100755
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@ dnl                                               -*- Autoconf -*-
 dnl Process this file with autoconf to produce a configure script.
 
 AC_PREREQ([2.67])
-AC_INIT([shadowsocks-libev], [2.3.3], [max.c.lv@gmail.com])
+AC_INIT([shadowsocks-libev], [2.4.0], [max.c.lv@gmail.com])
 AC_CONFIG_SRCDIR([src/encrypt.c])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_AUX_DIR(auto)
diff --git a/debian/changelog b/debian/changelog
index dbbcdcb8..7d776f31 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+shadowsocks-libev (2.4.0-1) unstable; urgency=low
+
+  * Update the one-time authentication
+
+ -- Max Lv <max.c.lv@gmail.com>  Thu, 24 Sep 2015 14:11:05 +0900
+
 shadowsocks-libev (2.3.3-1) unstable; urgency=low
 
   * Refine the onetime authentication of header.
diff --git a/debian/libshadowsocks1.symbols b/debian/libshadowsocks1.symbols
index 08260eeb..3410c5da 100644
--- a/debian/libshadowsocks1.symbols
+++ b/debian/libshadowsocks1.symbols
@@ -1,8 +1,8 @@
 libshadowsocks.so.1 libshadowsocks1 #MINVER#
  ERROR@Base 2.3.1
  FATAL@Base 2.3.1
- _crypto_stream_salsa20@Base 2.3.1
- _crypto_stream_salsa20_xor_ic@Base 2.3.1
+ #MISSING: 2.4.0-1 _crypto_stream_salsa20@Base 2.3.1
+ #MISSING: 2.4.0-1 _crypto_stream_salsa20_xor_ic@Base 2.3.1
  _dns_format_code@Base 2.3.1
  acl_contains_ip@Base 2.3.1
  bytes_to_key@Base 2.3.1
@@ -572,6 +572,16 @@ libshadowsocks.so.1 libshadowsocks1 #MINVER#
  set_nofile@Base 2.3.1
  setinterface@Base 2.3.1
  setnonblocking@Base 2.3.1
+ sha1@Base 2.4.0-1
+ sha1_finish@Base 2.4.0-1
+ sha1_hmac@Base 2.4.0-1
+ sha1_hmac_finish@Base 2.4.0-1
+ sha1_hmac_reset@Base 2.4.0-1
+ sha1_hmac_starts@Base 2.4.0-1
+ sha1_hmac_update@Base 2.4.0-1
+ sha1_process@Base 2.4.0-1
+ sha1_starts@Base 2.4.0-1
+ sha1_update@Base 2.4.0-1
  sodium_allocarray@Base 2.3.1
  sodium_bin2hex@Base 2.3.1
  sodium_free@Base 2.3.1
diff --git a/debian/source/format b/debian/source/format
deleted file mode 100644
index 163aaf8d..00000000
--- a/debian/source/format
+++ /dev/null
@@ -1 +0,0 @@
-3.0 (quilt)
diff --git a/openwrt/Makefile b/openwrt/Makefile
index 9deb5caf..3078d557 100644
--- a/openwrt/Makefile
+++ b/openwrt/Makefile
@@ -1,7 +1,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=shadowsocks-libev
-PKG_VERSION:=2.3.3
+PKG_VERSION:=2.4.0
 PKG_RELEASE=$(PKG_SOURCE_VERSION)
 
 PKG_SOURCE_URL:=https://github.com/shadowsocks/shadowsocks-libev/archive