diff --git a/package.json b/package.json
index 573b34f..30906e6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@lendry-erp/contracts",
-  "version": "1.2.39",
+  "version": "1.2.40",
   "description": "Protobuf definitions and generated TypeScript types",
   "type": "commonjs",
   "main": "./dist/index.js",
diff --git a/proto/chat/chat.proto b/proto/chat/chat.proto
index 188b5b7..5f8646c 100644
--- a/proto/chat/chat.proto
+++ b/proto/chat/chat.proto
@@ -24,6 +24,8 @@ service ChatService {
   
   // Статусы
   rpc MarkAsRead(MarkAsReadRequest) returns (MarkAsReadResponse);
+
+  rpc CheckChatMembership(CheckChatMembershipRequest) returns (CheckChatMembershipResponse);
 }
 
 // --- СТРУКТУРЫ ДАННЫХ --- //
@@ -152,3 +154,13 @@ message MarkAsReadRequest {
   string message_id = 3; // ID последнего видимого сообщения
 }
 message MarkAsReadResponse { bool success = 1; }
+
+
+message CheckChatMembershipRequest {
+  string user_id = 1;
+  string chat_id = 2;
+}
+
+message CheckChatMembershipResponse {
+  bool is_member = 1;
+}
\ No newline at end of file