diff --git a/README.md b/README.md
index fdd569b..88ff063 100644
--- a/README.md
+++ b/README.md
@@ -53,7 +53,7 @@ Please use a config file and make sure you are the only one who can access it.
 
 <del>For OpenWrt users, you can download prebuilt binary from [releases](https://github.com/robertying/tunet-c/releases).</del>
 
-_**There are no prebuilt binary for newer versions. The following guide only serves as a reference.**_
+_**There is no prebuilt binary for newer versions. The following guide only serves as a reference for installation. You need to [compile the binary](#Build-From-Source) by yourself.**_
 
 Upload them to your router and use `opkg` to install packages.
 
@@ -61,8 +61,8 @@ For example, if you are using a `mipsel_24kc` router and packages are uploaded t
 
 ```sh
 opkg install /tmp/libtidy_5.7.28-1_mipsel_24kc.ipk
-opkg install /tmp/libtunet_3.0.0-1_mipsel_24kc.ipk
-opkg install /tmp/tunet_3.0.0-1_mipsel_24kc.ipk
+opkg install /tmp/libtunet_4.0.0-1_mipsel_24kc.ipk
+opkg install /tmp/tunet_4.0.0-1_mipsel_24kc.ipk
 ```
 
 You could add an init script to run `tunet` on boot.
diff --git a/configure.ac b/configure.ac
index 931b296..a96b898 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-AC_INIT([tunet], [3.0.0], [https://github.com/robertying/tunet-c])
+AC_INIT([tunet], [4.0.0], [https://github.com/robertying/tunet-c])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE([foreign -Wall])
diff --git a/openwrt/tunet/Makefile b/openwrt/tunet/Makefile
index bd2dbcc..41f68b5 100644
--- a/openwrt/tunet/Makefile
+++ b/openwrt/tunet/Makefile
@@ -1,7 +1,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=tunet
-PKG_VERSION:=3.0.0
+PKG_VERSION:=4.0.0
 PKG_RELEASE:=1
 
 PKG_MAINTAINER:=Rui Ying <yingrui205@gmail.com>
@@ -9,7 +9,7 @@ PKG_LICENSE:=MIT
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/robertying/tunet-c/releases/download/v$(PKG_VERSION)
-PKG_HASH:=7b4da4268ba9745117064cd38cc74a4a2e577b5a3d0f8b4fa448e86d4f80a0bd
+PKG_HASH:=554ca8bf1ebf85e5331da987a3d1f7eae2e2f8a979cf91f055d40d751554896a
 
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)