diff --git a/shadowsocks-all.sh b/shadowsocks-all.sh
index 9c4e159..19c2285 100644
--- a/shadowsocks-all.sh
+++ b/shadowsocks-all.sh
@@ -21,6 +21,9 @@
 # 
 # Intro:  https://teddysun.com/486.html
 
+PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
+export PATH
+
 red='\033[0;31m'
 green='\033[0;32m'
 yellow='\033[0;33m'
@@ -31,8 +34,8 @@ plain='\033[0m'
 cur_dir=$( pwd )
 software=(Shadowsocks-Python ShadowsocksR Shadowsocks-Go Shadowsocks-libev)
 
-libsodium_file="libsodium-1.0.13"
-libsodium_url="https://github.com/jedisct1/libsodium/releases/download/1.0.13/libsodium-1.0.13.tar.gz"
+libsodium_file="libsodium-1.0.15"
+libsodium_url="https://github.com/jedisct1/libsodium/releases/download/1.0.15/libsodium-1.0.15.tar.gz"
 
 mbedtls_file="mbedtls-2.6.0"
 mbedtls_url="http://dl.teddysun.com/files/mbedtls-2.6.0-gpl.tgz"
diff --git a/shadowsocks-libev-debian.sh b/shadowsocks-libev-debian.sh
index e2e963b..5aa0f63 100644
--- a/shadowsocks-libev-debian.sh
+++ b/shadowsocks-libev-debian.sh
@@ -12,8 +12,8 @@ export PATH
 # Current folder
 cur_dir=`pwd`
 
-libsodium_file="libsodium-1.0.13"
-libsodium_url="https://github.com/jedisct1/libsodium/releases/download/1.0.13/libsodium-1.0.13.tar.gz"
+libsodium_file="libsodium-1.0.15"
+libsodium_url="https://github.com/jedisct1/libsodium/releases/download/1.0.15/libsodium-1.0.15.tar.gz"
 
 mbedtls_file="mbedtls-2.6.0"
 mbedtls_url="http://dl.teddysun.com/files/mbedtls-2.6.0-gpl.tgz"
diff --git a/shadowsocks-libev.sh b/shadowsocks-libev.sh
index dbd0aa0..d34b11d 100644
--- a/shadowsocks-libev.sh
+++ b/shadowsocks-libev.sh
@@ -12,8 +12,8 @@ export PATH
 # Current folder
 cur_dir=`pwd`
 
-libsodium_file="libsodium-1.0.13"
-libsodium_url="https://github.com/jedisct1/libsodium/releases/download/1.0.13/libsodium-1.0.13.tar.gz"
+libsodium_file="libsodium-1.0.15"
+libsodium_url="https://github.com/jedisct1/libsodium/releases/download/1.0.15/libsodium-1.0.15.tar.gz"
 
 mbedtls_file="mbedtls-2.6.0"
 mbedtls_url="http://dl.teddysun.com/files/mbedtls-2.6.0-gpl.tgz"
diff --git a/shadowsocks.sh b/shadowsocks.sh
index f4e5821..45cd830 100644
--- a/shadowsocks.sh
+++ b/shadowsocks.sh
@@ -234,8 +234,8 @@ pre_install(){
 # Download files
 download_files(){
     # Download libsodium file
-    if ! wget --no-check-certificate -O libsodium-1.0.13.tar.gz https://github.com/jedisct1/libsodium/releases/download/1.0.13/libsodium-1.0.13.tar.gz; then
-        echo -e "[${red}Error${plain}] Failed to download libsodium-1.0.13.tar.gz!"
+    if ! wget --no-check-certificate -O libsodium-1.0.15.tar.gz https://github.com/jedisct1/libsodium/releases/download/1.0.15/libsodium-1.0.15.tar.gz; then
+        echo -e "[${red}Error${plain}] Failed to download libsodium-1.0.15.tar.gz!"
         exit 1
     fi
     # Download Shadowsocks file
diff --git a/shadowsocksR.sh b/shadowsocksR.sh
index fc856c0..2a2d0c4 100644
--- a/shadowsocksR.sh
+++ b/shadowsocksR.sh
@@ -314,8 +314,8 @@ pre_install(){
 # Download files
 download_files(){
     # Download libsodium file
-    if ! wget --no-check-certificate -O libsodium-1.0.13.tar.gz https://github.com/jedisct1/libsodium/releases/download/1.0.13/libsodium-1.0.13.tar.gz; then
-        echo -e "[${red}Error${plain}] Failed to download libsodium-1.0.13.tar.gz!"
+    if ! wget --no-check-certificate -O libsodium-1.0.15.tar.gz https://github.com/jedisct1/libsodium/releases/download/1.0.15/libsodium-1.0.15.tar.gz; then
+        echo -e "[${red}Error${plain}] Failed to download libsodium-1.0.15.tar.gz!"
         exit 1
     fi
     # Download ShadowsocksR file