diff --git a/sdk/sdk_readme.txt b/sdk/sdk_readme.txt
index 22762fab..0d68f994 100644
--- a/sdk/sdk_readme.txt
+++ b/sdk/sdk_readme.txt
@@ -21,7 +21,7 @@
 		<dependency>
 			<groupId>org.apache.httpcomponents</groupId>
 			<artifactId>httpclient</artifactId>
-			<version>4.5.3</version>
+			<version>4.5.13</version>
 		</dependency>
 
 		<dependency>
diff --git a/sdk/src/main/java/cn/wildfirechat/sdk/utilities/AdminHttpUtils.java b/sdk/src/main/java/cn/wildfirechat/sdk/utilities/AdminHttpUtils.java
index 94f77ea6..18bcbe1e 100644
--- a/sdk/src/main/java/cn/wildfirechat/sdk/utilities/AdminHttpUtils.java
+++ b/sdk/src/main/java/cn/wildfirechat/sdk/utilities/AdminHttpUtils.java
@@ -7,12 +7,16 @@ import org.apache.commons.codec.digest.DigestUtils;
 import org.apache.http.HttpResponse;
 import org.apache.http.HttpStatus;
 import org.apache.http.client.HttpClient;
+import org.apache.http.client.config.RequestConfig;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.client.methods.HttpPost;
+import org.apache.http.config.ConnectionConfig;
 import org.apache.http.entity.StringEntity;
 import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
 import org.apache.http.impl.client.HttpClientBuilder;
 import org.apache.http.impl.client.HttpClients;
+import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -20,6 +24,7 @@ import java.io.BufferedReader;
 import java.io.InputStreamReader;
 import java.lang.reflect.Type;
 import java.nio.charset.Charset;
+import java.util.concurrent.TimeUnit;
 
 
 public class AdminHttpUtils extends JsonUtils {
@@ -32,7 +37,16 @@ public class AdminHttpUtils extends JsonUtils {
     public static void init(String url, String secret) {
         adminUrl = url;
         adminSecret = secret;
-        httpClient = HttpClients.createDefault();
+        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
+        cm.setValidateAfterInactivity(1000);
+        httpClient = HttpClients.custom()
+            .setConnectionManager(cm)
+            .evictExpiredConnections()
+            .evictIdleConnections(60L, TimeUnit.SECONDS)
+            .setRetryHandler(DefaultHttpRequestRetryHandler.INSTANCE)
+            .setMaxConnTotal(100)
+            .setMaxConnPerRoute(50)
+            .build();
     }
 
     public static <T> IMResult<T> httpGet(String path, Class<T> clazz) throws Exception {
diff --git a/sdk/src/main/java/cn/wildfirechat/sdk/utilities/ChannelHttpUtils.java b/sdk/src/main/java/cn/wildfirechat/sdk/utilities/ChannelHttpUtils.java
index 85918015..e6663247 100644
--- a/sdk/src/main/java/cn/wildfirechat/sdk/utilities/ChannelHttpUtils.java
+++ b/sdk/src/main/java/cn/wildfirechat/sdk/utilities/ChannelHttpUtils.java
@@ -10,8 +10,10 @@ import org.apache.http.client.HttpClient;
 import org.apache.http.client.methods.HttpPost;
 import org.apache.http.entity.StringEntity;
 import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
 import org.apache.http.impl.client.HttpClientBuilder;
 import org.apache.http.impl.client.HttpClients;
+import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -19,6 +21,7 @@ import java.io.BufferedReader;
 import java.io.InputStreamReader;
 import java.lang.reflect.Type;
 import java.nio.charset.Charset;
+import java.util.concurrent.TimeUnit;
 
 
 public class ChannelHttpUtils extends JsonUtils {
@@ -33,7 +36,16 @@ public class ChannelHttpUtils extends JsonUtils {
         this.imurl = imurl;
         this.channelId = channelId;
         this.channelSecret = secret;
-        this.httpClient = HttpClients.createDefault();
+        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
+        cm.setValidateAfterInactivity(1000);
+        httpClient = HttpClients.custom()
+            .setConnectionManager(cm)
+            .evictExpiredConnections()
+            .evictIdleConnections(60L, TimeUnit.SECONDS)
+            .setRetryHandler(DefaultHttpRequestRetryHandler.INSTANCE)
+            .setMaxConnTotal(100)
+            .setMaxConnPerRoute(50)
+            .build();
     }
 
     public <T> IMResult<T> httpJsonPost(String path, Object object, Class<T> clazz) throws Exception{
diff --git a/sdk/src/main/java/cn/wildfirechat/sdk/utilities/RobotHttpUtils.java b/sdk/src/main/java/cn/wildfirechat/sdk/utilities/RobotHttpUtils.java
index e3747a58..fdf36479 100644
--- a/sdk/src/main/java/cn/wildfirechat/sdk/utilities/RobotHttpUtils.java
+++ b/sdk/src/main/java/cn/wildfirechat/sdk/utilities/RobotHttpUtils.java
@@ -11,8 +11,10 @@ import org.apache.http.client.HttpClient;
 import org.apache.http.client.methods.HttpPost;
 import org.apache.http.entity.StringEntity;
 import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
 import org.apache.http.impl.client.HttpClientBuilder;
 import org.apache.http.impl.client.HttpClients;
+import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -20,6 +22,7 @@ import java.io.BufferedReader;
 import java.io.InputStreamReader;
 import java.lang.reflect.Type;
 import java.nio.charset.Charset;
+import java.util.concurrent.TimeUnit;
 
 
 public class RobotHttpUtils extends JsonUtils {
@@ -34,7 +37,16 @@ public class RobotHttpUtils extends JsonUtils {
         this.url = url;
         this.robotId = robotId;
         this.robotSecret = robotSecret;
-        this.httpClient = HttpClients.createDefault();
+        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
+        cm.setValidateAfterInactivity(1000);
+        httpClient = HttpClients.custom()
+            .setConnectionManager(cm)
+            .evictExpiredConnections()
+            .evictIdleConnections(60L, TimeUnit.SECONDS)
+            .setRetryHandler(DefaultHttpRequestRetryHandler.INSTANCE)
+            .setMaxConnTotal(100)
+            .setMaxConnPerRoute(50)
+            .build();
     }