diff --git a/proto/common/v2/common.proto b/proto/common/v2/common.proto
index 3aef0bc..dab77e0 100644
--- a/proto/common/v2/common.proto
+++ b/proto/common/v2/common.proto
@@ -1,4 +1,4 @@
-syntax = "proto2";
+syntax = "proto3";
 
 package common.v2;
 
diff --git a/proto/login/v2/login.proto b/proto/login/v2/login.proto
index 073e218..b7ffcf0 100644
--- a/proto/login/v2/login.proto
+++ b/proto/login/v2/login.proto
@@ -1,4 +1,4 @@
-syntax = "proto2";
+syntax = "proto3";
 
 package login.v2;
 
diff --git a/proto/message/v2/message.proto b/proto/message/v2/message.proto
index ee4918b..913795f 100644
--- a/proto/message/v2/message.proto
+++ b/proto/message/v2/message.proto
@@ -1,4 +1,4 @@
-syntax = "proto2";
+syntax = "proto3";
 
 package message.v2;
 
diff --git a/proto/notify/v2/notify.proto b/proto/notify/v2/notify.proto
index 1fb7ce0..79077e2 100644
--- a/proto/notify/v2/notify.proto
+++ b/proto/notify/v2/notify.proto
@@ -1,4 +1,4 @@
-syntax = "proto2";
+syntax = "proto3";
 
 package notify.v2;
 
diff --git a/proto/service/highway/v2/highway.proto b/proto/service/highway/v2/highway.proto
index ed10d29..3a1ac2f 100644
--- a/proto/service/highway/v2/highway.proto
+++ b/proto/service/highway/v2/highway.proto
@@ -1,4 +1,4 @@
-syntax = "proto2";
+syntax = "proto3";
 
 package service.highway.v2;
 
diff --git a/proto/service/v2/oidb.proto b/proto/service/v2/oidb.proto
index 249af62..4609af3 100644
--- a/proto/service/v2/oidb.proto
+++ b/proto/service/v2/oidb.proto
@@ -1,4 +1,4 @@
-syntax = "proto2";
+syntax = "proto3";
 
 package service.v2;
 
diff --git a/proto/service/v2/operation.proto b/proto/service/v2/operation.proto
index 0c1806f..7935592 100644
--- a/proto/service/v2/operation.proto
+++ b/proto/service/v2/operation.proto
@@ -1,4 +1,4 @@
-syntax = "proto2";
+syntax = "proto3";
 
 package service.v2;
 
diff --git a/proto/system/v2/system.proto b/proto/system/v2/system.proto
index b461cbc..7007729 100644
--- a/proto/system/v2/system.proto
+++ b/proto/system/v2/system.proto
@@ -1,4 +1,4 @@
-syntax = "proto2";
+syntax = "proto3";
 package system.v2;
 
 import "message/v2/message.proto";