diff --git a/HISTORY b/HISTORY
index b1a12b7..64bd5a0 100644
--- a/HISTORY
+++ b/HISTORY
@@ -1,3 +1,8 @@
+
+Version 1.31  2023-12-07
+  * adapt to FastDFS server V6.11 for IPv6
+    you must upgrade your FastDFS server to V6.11 or higher version
+
 Version 1.30  2023-01-29
   * support tracker server fail over
     If the tracker server is not specified, when the tracker server fails to
diff --git a/README.md b/README.md
index b69c30f..c5a5418 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ mvn install:install-file -DgroupId=org.csource -DartifactId=fastdfs-client-java
 <dependency>
     <groupId>org.csource</groupId>
     <artifactId>fastdfs-client-java</artifactId>
-    <version>1.30-SNAPSHOT</version>
+    <version>1.31-SNAPSHOT</version>
 </dependency>
 ```
 
diff --git a/pom.xml b/pom.xml
index 65f6ea2..ac5d66e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
 
   <groupId>org.csource</groupId>
   <artifactId>fastdfs-client-java</artifactId>
-  <version>1.30-SNAPSHOT</version>
+  <version>1.31-SNAPSHOT</version>
   <name>fastdfs-client-java</name>
   <description>fastdfs client for java</description>
   <packaging>jar</packaging>
diff --git a/src/main/java/org/csource/fastdfs/ClientGlobal.java b/src/main/java/org/csource/fastdfs/ClientGlobal.java
index 4041139..0cccf01 100644
--- a/src/main/java/org/csource/fastdfs/ClientGlobal.java
+++ b/src/main/java/org/csource/fastdfs/ClientGlobal.java
@@ -49,8 +49,6 @@ public class ClientGlobal {
   public static final String PROP_KEY_CONNECTION_POOL_MAX_IDLE_TIME = "fastdfs.connection_pool.max_idle_time";
   public static final String PROP_KEY_CONNECTION_POOL_MAX_WAIT_TIME_IN_MS = "fastdfs.connection_pool.max_wait_time_in_ms";
 
-  public static final String PROP_KEY_SERVER_IPV6_ENABLED = "fastdfs.server_ipv6.enabled";
-
   public static final int DEFAULT_CONNECT_TIMEOUT = 5; //second
   public static final int DEFAULT_NETWORK_TIMEOUT = 30; //second
   public static final String DEFAULT_CHARSET = "UTF-8";
@@ -148,9 +146,6 @@ public class ClientGlobal {
     if (g_connection_pool_max_wait_time_in_ms < 0) {
       g_connection_pool_max_wait_time_in_ms = DEFAULT_CONNECTION_POOL_MAX_WAIT_TIME_IN_MS;
     }
-    if(iniReader.getBoolValue("server_ipv6.enabled",false)){
-      ProtoCommon.useIPv6();
-    }
   }
 
   /**
@@ -192,7 +187,6 @@ public class ClientGlobal {
     String poolMaxCountPerEntry = props.getProperty(PROP_KEY_CONNECTION_POOL_MAX_COUNT_PER_ENTRY);
     String poolMaxIdleTime  = props.getProperty(PROP_KEY_CONNECTION_POOL_MAX_IDLE_TIME);
     String poolMaxWaitTimeInMS = props.getProperty(PROP_KEY_CONNECTION_POOL_MAX_WAIT_TIME_IN_MS);
-    String serverIPv6Enabled = props.getProperty(PROP_KEY_SERVER_IPV6_ENABLED);
     if (connectTimeoutInSecondsConf != null && connectTimeoutInSecondsConf.trim().length() != 0) {
       g_connect_timeout = Integer.parseInt(connectTimeoutInSecondsConf.trim()) * 1000;
     }
@@ -223,11 +217,6 @@ public class ClientGlobal {
     if (poolMaxWaitTimeInMS != null && poolMaxWaitTimeInMS.trim().length() != 0) {
       g_connection_pool_max_wait_time_in_ms = Integer.parseInt(poolMaxWaitTimeInMS);
     }
-    if (serverIPv6Enabled != null && serverIPv6Enabled.trim().length() != 0) {
-      if(Boolean.parseBoolean(poolEnabled)){
-        ProtoCommon.useIPv6();
-      }
-    }
   }
 
   /**
@@ -243,11 +232,11 @@ public class ClientGlobal {
     String spr2 = ":";
     String[] arr1 = trackerServers.trim().split(spr1);
     for (String addrStr : arr1) {
-      if(addrStr.contains("[")){
+      if(addrStr.contains("[")) {
         String host = addrStr.substring(1, addrStr.indexOf("]"));
         int port = Integer.parseInt(addrStr.substring(addrStr.lastIndexOf(":") + 1));
         list.add(new InetSocketAddress(InetAddress.getByName(host), port));
-      }else {
+      } else {
         String[] arr2 = addrStr.trim().split(spr2);
         String host = arr2[0].trim();
         int port = Integer.parseInt(arr2[1].trim());
diff --git a/src/main/java/org/csource/fastdfs/ProtoCommon.java b/src/main/java/org/csource/fastdfs/ProtoCommon.java
index 8586a58..a8a4de7 100644
--- a/src/main/java/org/csource/fastdfs/ProtoCommon.java
+++ b/src/main/java/org/csource/fastdfs/ProtoCommon.java
@@ -72,17 +72,15 @@ public class ProtoCommon {
   public static final int FDFS_PROTO_PKG_LEN_SIZE = 8;
   public static final int FDFS_PROTO_CMD_SIZE = 1;
   public static final int FDFS_GROUP_NAME_MAX_LEN = 16;
-  public static final int FDFS_IPADDR_V4_SIZE = 16;
-  public static final int FDFS_IPADDR_V6_SIZE = 46;
-  public static int FDFS_IPADDR_SIZE = FDFS_IPADDR_V4_SIZE;
+  public static final int FDFS_IPADDR_SIZE = 46;
   public static final int FDFS_DOMAIN_NAME_MAX_SIZE = 128;
   public static final int FDFS_VERSION_SIZE = 6;
   public static final int FDFS_STORAGE_ID_MAX_SIZE = 16;
   public static final String FDFS_RECORD_SEPERATOR = "\u0001";
   public static final String FDFS_FIELD_SEPERATOR = "\u0002";
-  public static int TRACKER_QUERY_STORAGE_FETCH_BODY_LEN = FDFS_GROUP_NAME_MAX_LEN
+  public static final int TRACKER_QUERY_STORAGE_FETCH_BODY_LEN = FDFS_GROUP_NAME_MAX_LEN
     + FDFS_IPADDR_SIZE - 1 + FDFS_PROTO_PKG_LEN_SIZE;
-  public static int TRACKER_QUERY_STORAGE_STORE_BODY_LEN = FDFS_GROUP_NAME_MAX_LEN
+  public static final int TRACKER_QUERY_STORAGE_STORE_BODY_LEN = FDFS_GROUP_NAME_MAX_LEN
     + FDFS_IPADDR_SIZE + FDFS_PROTO_PKG_LEN_SIZE;
   public static final byte FDFS_FILE_EXT_NAME_MAX_LEN = 6;
   public static final byte FDFS_FILE_PREFIX_MAX_LEN = 16;
@@ -504,16 +502,4 @@ public class ProtoCommon {
       this.body_len = body_len;
     }
   }
-
-  /**
-   * 设置系统使用IPv6地址进行通信
-   */
-  public static void useIPv6(){
-    FDFS_IPADDR_SIZE = FDFS_IPADDR_V6_SIZE;
-
-    TRACKER_QUERY_STORAGE_FETCH_BODY_LEN = FDFS_GROUP_NAME_MAX_LEN
-            + FDFS_IPADDR_SIZE - 1 + FDFS_PROTO_PKG_LEN_SIZE;
-    TRACKER_QUERY_STORAGE_STORE_BODY_LEN = FDFS_GROUP_NAME_MAX_LEN
-            + FDFS_IPADDR_SIZE + FDFS_PROTO_PKG_LEN_SIZE;
-  }
 }
diff --git a/src/main/resources/fastdfs-client.properties.sample b/src/main/resources/fastdfs-client.properties.sample
index 38217c9..cd1fcf0 100644
--- a/src/main/resources/fastdfs-client.properties.sample
+++ b/src/main/resources/fastdfs-client.properties.sample
@@ -29,5 +29,3 @@ fastdfs.connection_pool.max_idle_time = 3600
 
 ## Maximum waiting time when the maximum number of connections is reached, unit: millisecond, default value is 1000
 fastdfs.connection_pool.max_wait_time_in_ms = 1000
-
-server_ipv6.enabled = false
\ No newline at end of file
diff --git a/src/main/resources/fdfs_client.conf.sample b/src/main/resources/fdfs_client.conf.sample
index ff99ef7..cd90a5a 100644
--- a/src/main/resources/fdfs_client.conf.sample
+++ b/src/main/resources/fdfs_client.conf.sample
@@ -19,5 +19,3 @@ connection_pool.enabled = true
 connection_pool.max_count_per_entry = 500
 connection_pool.max_idle_time = 3600
 connection_pool.max_wait_time_in_ms = 1000
-
-server_ipv6.enabled = false
\ No newline at end of file