diff --git a/sdk/android-ios/release_android.sh b/sdk/android-ios/release_android.sh
index d591df8..7d12525 100755
--- a/sdk/android-ios/release_android.sh
+++ b/sdk/android-ios/release_android.sh
@@ -1,5 +1,5 @@
 #/bin/bash
-VER="v5.0"
+VER="v5.2"
 rm -rf sdk-android-*.tar.gz
 rm -rf android
 mkdir android
diff --git a/sdk/android-ios/release_ios.sh b/sdk/android-ios/release_ios.sh
index d7b6e00..96a50af 100755
--- a/sdk/android-ios/release_ios.sh
+++ b/sdk/android-ios/release_ios.sh
@@ -1,5 +1,5 @@
 #/bin/bash
-VER="v5.0"
+VER="v5.2"
 rm -rf sdk-ios-*.tar.gz
 rm -rf ios
 mkdir ios
diff --git a/sdk/android-ios/sdk.go b/sdk/android-ios/sdk.go
index db1882a..fd5c898 100644
--- a/sdk/android-ios/sdk.go
+++ b/sdk/android-ios/sdk.go
@@ -23,7 +23,7 @@ import (
 	kingpin "gopkg.in/alecthomas/kingpin.v2"
 )
 
-const SDK_VERSION = "5.0"
+const SDK_VERSION = "5.2"
 
 var (
 	app *kingpin.Application
diff --git a/sdk/windows-linux/release_linux.sh b/sdk/windows-linux/release_linux.sh
index de15e3d..a6653d8 100755
--- a/sdk/windows-linux/release_linux.sh
+++ b/sdk/windows-linux/release_linux.sh
@@ -1,5 +1,5 @@
 #/bin/bash
-VER="v5.0"
+VER="v5.2"
 
 rm -rf sdk-linux-*.tar.gz
 rm -rf README.md libproxy-sdk.so libproxy-sdk.h libproxy-sdk.a
diff --git a/sdk/windows-linux/release_mac.sh b/sdk/windows-linux/release_mac.sh
index afa9a02..a872e3c 100755
--- a/sdk/windows-linux/release_mac.sh
+++ b/sdk/windows-linux/release_mac.sh
@@ -1,5 +1,5 @@
 #/bin/bash
-VER="v5.0"
+VER="v5.2"
 
 rm -rf *.tar.gz
 rm -rf README.md libproxy-sdk.dylib libproxy-sdk.h
diff --git a/sdk/windows-linux/release_windows.sh b/sdk/windows-linux/release_windows.sh
index 7a3b06d..176f832 100755
--- a/sdk/windows-linux/release_windows.sh
+++ b/sdk/windows-linux/release_windows.sh
@@ -1,8 +1,8 @@
 #/bin/bash
-VER="v5.0"
+VER="v5.2"
 
-sudo rm /usr/local/go
-sudo ln -s /usr/local/go1.10.1 /usr/local/go
+#sudo rm /usr/local/go
+#sudo ln -s /usr/local/go1.10.1 /usr/local/go
 rm -rf sdk-windows-*.tar.gz
 rm -rf README.md proxy-sdk.h proxy-sdk.dll
 
@@ -22,7 +22,7 @@ cp ../README.md .
 tar zcf sdk-windows-32bit-${VER}.tar.gz README.md proxy-sdk.dll proxy-sdk.h ieshims.dll
 rm -rf README.md proxy-sdk.h proxy-sdk.dll
 
-sudo rm /usr/local/go
-sudo ln -s /usr/local/go1.8.5 /usr/local/go
+#sudo rm /usr/local/go
+#sudo ln -s /usr/local/go1.8.5 /usr/local/go
 
 echo "done."
diff --git a/utils/functions.go b/utils/functions.go
index fe9d470..305ccc1 100755
--- a/utils/functions.go
+++ b/utils/functions.go
@@ -30,6 +30,8 @@ import (
 	"github.com/snail007/goproxy/utils/id"
 
 	kcp "github.com/xtaci/kcp-go"
+
+	"context"
 )
 
 func IoBind(dst io.ReadWriteCloser, src io.ReadWriteCloser, fn func(err interface{}), log *logger.Logger) {
@@ -639,7 +641,6 @@ func InsertProxyHeaders(head []byte, headers string) []byte {
 net.LookupIP may cause  deadlock in windows
 https://github.com/golang/go/issues/24178
 */
-
 func MyLookupIP(host string) ([]net.IP, error) {
 
 	ctx ,cancel := context.WithTimeout(context.Background(),time.Second *time.Duration(3))
@@ -656,4 +657,4 @@ func MyLookupIP(host string) ([]net.IP, error) {
 		ips[i] = ia.IP
 	}
 	return ips, nil
-}
\ No newline at end of file
+}