diff --git a/proxy/shadowsocks/config.pb.go b/proxy/shadowsocks/config.pb.go
index 7b6386530..e4109adaa 100644
--- a/proxy/shadowsocks/config.pb.go
+++ b/proxy/shadowsocks/config.pb.go
@@ -1,12 +1,13 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.26.0
-// 	protoc        v3.15.6
+// 	protoc-gen-go v1.25.0
+// 	protoc        v3.13.0
 // source: proxy/shadowsocks/config.proto
 
 package shadowsocks
 
 import (
+	proto "github.com/golang/protobuf/proto"
 	net "github.com/v2fly/v2ray-core/v4/common/net"
 	protocol "github.com/v2fly/v2ray-core/v4/common/protocol"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
@@ -22,6 +23,10 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
+// This is a compile-time assertion that a sufficiently up-to-date version
+// of the legacy proto package is being used.
+const _ = proto.ProtoPackageIsVersion4
+
 type CipherType int32
 
 const (
@@ -82,8 +87,9 @@ type Account struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Password   string     `protobuf:"bytes,1,opt,name=password,proto3" json:"password,omitempty"`
-	CipherType CipherType `protobuf:"varint,2,opt,name=cipher_type,json=cipherType,proto3,enum=v2ray.core.proxy.shadowsocks.CipherType" json:"cipher_type,omitempty"`
+	Password         string     `protobuf:"bytes,1,opt,name=password,proto3" json:"password,omitempty"`
+	CipherType       CipherType `protobuf:"varint,2,opt,name=cipher_type,json=cipherType,proto3,enum=v2ray.core.proxy.shadowsocks.CipherType" json:"cipher_type,omitempty"`
+	ReplayProtection bool       `protobuf:"varint,3,opt,name=replay_protection,json=replayProtection,proto3" json:"replay_protection,omitempty"`
 }
 
 func (x *Account) Reset() {
@@ -132,6 +138,13 @@ func (x *Account) GetCipherType() CipherType {
 	return CipherType_UNKNOWN
 }
 
+func (x *Account) GetReplayProtection() bool {
+	if x != nil {
+		return x.ReplayProtection
+	}
+	return false
+}
+
 type ServerConfig struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -259,43 +272,46 @@ var file_proxy_shadowsocks_config_proto_rawDesc = []byte{
 	0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x2f, 0x75, 0x73, 0x65, 0x72, 0x2e, 0x70,
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 }
 
 var (
diff --git a/proxy/shadowsocks/config.proto b/proxy/shadowsocks/config.proto
index fcee27018..f96ada255 100644
--- a/proxy/shadowsocks/config.proto
+++ b/proxy/shadowsocks/config.proto
@@ -13,6 +13,8 @@ import "common/protocol/server_spec.proto";
 message Account {
   string password = 1;
   CipherType cipher_type = 2;
+
+  bool replay_protection = 3;
 }
 
 enum CipherType {