diff --git a/Podfile b/Podfile
index a4a0c03..8361bb0 100644
--- a/Podfile
+++ b/Podfile
@@ -19,3 +19,11 @@ end
 target 'proxy_conf_helper' do
   pod 'BRLOptionParser', '~> 0.3.1'
 end
+
+post_install do |installer|
+  installer.pods_project.targets.each do |target|
+    target.build_configurations.each do |config|
+      config.build_settings['SWIFT_VERSION'] = '2.3'
+    end
+  end
+end
diff --git a/ShadowsocksX-NG/LaunchAgentUtils.swift b/ShadowsocksX-NG/LaunchAgentUtils.swift
index c9d61f1..9f7a7b3 100644
--- a/ShadowsocksX-NG/LaunchAgentUtils.swift
+++ b/ShadowsocksX-NG/LaunchAgentUtils.swift
@@ -8,7 +8,7 @@
 
 import Foundation
 
-let SS_LOCAL_VERSION = "2.4.8"
+let SS_LOCAL_VERSION = "2.4.9"
 let APP_SUPPORT_DIR = "/Library/Application Support/ShadowsocksX-NG/"
 let LAUNCH_AGENT_DIR = "/Library/LaunchAgents/"
 let LAUNCH_AGENT_CONF_NAME = "com.qiuyuzhou.shadowsocksX-NG.local.plist"
diff --git a/ShadowsocksX-NG/NetWorkMonitor.swift b/ShadowsocksX-NG/NetWorkMonitor.swift
index 29b8590..f8888fe 100755
--- a/ShadowsocksX-NG/NetWorkMonitor.swift
+++ b/ShadowsocksX-NG/NetWorkMonitor.swift
@@ -32,7 +32,9 @@ public class NetWorkMonitor: NSObject {
             alertView.messageText = "网速显示不支持 macOS 10.12 Sierra!"
             alertView.informativeText = "因为 macOS 10.12 Sierra ABI 不稳定，因此暂时移除网速功能"
             alertView.addButtonWithTitle("取消网速显示")
-            alertView.runModal()
+            dispatch_sync(dispatch_get_main_queue(), { Void in
+                alertView.runModal()
+            })
             stop()
 //            NSRunLoop.currentRunLoop().run()
 //            CFRunLoopRun()
diff --git a/ShadowsocksX-NG/PreferencesWindowController.swift b/ShadowsocksX-NG/PreferencesWindowController.swift
index 99cf659..12739fa 100644
--- a/ShadowsocksX-NG/PreferencesWindowController.swift
+++ b/ShadowsocksX-NG/PreferencesWindowController.swift
@@ -75,6 +75,7 @@ class PreferencesWindowController: NSWindowController
             "verify_sha1",
             "auth_sha1",
             "auth_sha1_v2",
+            "auth_sha1_v4",
             ])
         ObfsTextField.addItemsWithObjectValues([
             "palin",
diff --git a/ShadowsocksX-NG/install_ss_local.sh b/ShadowsocksX-NG/install_ss_local.sh
index 41d78f9..7d8affa 100755
--- a/ShadowsocksX-NG/install_ss_local.sh
+++ b/ShadowsocksX-NG/install_ss_local.sh
@@ -8,11 +8,12 @@
 
 
 cd `dirname "${BASH_SOURCE[0]}"`
-mkdir -p "$HOME/Library/Application Support/ShadowsocksX-NG/ss-local-2.4.8"
-cp -f ss-local "$HOME/Library/Application Support/ShadowsocksX-NG/ss-local-2.4.8/"
+ssLocalVersion=2.4.9
+mkdir -p "$HOME/Library/Application Support/ShadowsocksX-NG/ss-local-$ssLocalVersion"
+cp -f ss-local "$HOME/Library/Application Support/ShadowsocksX-NG/ss-local-$ssLocalVersion/"
 rm -f "$HOME/Library/Application Support/ShadowsocksX-NG/ss-local"
-ln -s "$HOME/Library/Application Support/ShadowsocksX-NG/ss-local-2.4.8/ss-local" "$HOME/Library/Application Support/ShadowsocksX-NG/ss-local"
+ln -s "$HOME/Library/Application Support/ShadowsocksX-NG/ss-local-$ssLocalVersion/ss-local" "$HOME/Library/Application Support/ShadowsocksX-NG/ss-local"
 
 cp -f libcrypto.1.0.0.dylib "$HOME/Library/Application Support/ShadowsocksX-NG/"
 
-echo done
\ No newline at end of file
+echo done
diff --git a/ShadowsocksX-NG/ss-local b/ShadowsocksX-NG/ss-local
index 2d2aea4..1e5d4c2 100755
Binary files a/ShadowsocksX-NG/ss-local and b/ShadowsocksX-NG/ss-local differ