diff --git a/shadowsocks-all.sh b/shadowsocks-all.sh
index 543f92a..c9565cb 100644
--- a/shadowsocks-all.sh
+++ b/shadowsocks-all.sh
@@ -27,8 +27,8 @@ software=(Shadowsocks-Python ShadowsocksR Shadowsocks-Go Shadowsocks-libev)
 libsodium_file="libsodium-1.0.12"
 libsodium_url="https://github.com/jedisct1/libsodium/releases/download/1.0.12/libsodium-1.0.12.tar.gz"
 
-mbedtls_file="mbedtls-2.4.0"
-mbedtls_url="https://tls.mbed.org/download/mbedtls-2.4.0-gpl.tgz"
+mbedtls_file="mbedtls-2.4.2"
+mbedtls_url="https://tls.mbed.org/download/mbedtls-2.4.2-gpl.tgz"
 
 shadowsocks_python_file="shadowsocks-master"
 shadowsocks_python_url="https://github.com/shadowsocks/shadowsocks/archive/master.zip"
diff --git a/shadowsocks-libev-debian.sh b/shadowsocks-libev-debian.sh
index 15839a2..df3e340 100644
--- a/shadowsocks-libev-debian.sh
+++ b/shadowsocks-libev-debian.sh
@@ -15,8 +15,8 @@ cur_dir=`pwd`
 libsodium_file="libsodium-1.0.12"
 libsodium_url="https://github.com/jedisct1/libsodium/releases/download/1.0.12/libsodium-1.0.12.tar.gz"
 
-mbedtls_file="mbedtls-2.4.0"
-mbedtls_url="https://tls.mbed.org/download/mbedtls-2.4.0-gpl.tgz"
+mbedtls_file="mbedtls-2.4.2"
+mbedtls_url="https://tls.mbed.org/download/mbedtls-2.4.2-gpl.tgz"
 
 # Make sure only root can run our script
 rootness(){