diff --git a/app/utils.py b/app/utils.py
index 74bd2ac..d8cc57f 100644
--- a/app/utils.py
+++ b/app/utils.py
@@ -1,6 +1,6 @@
 import json
 from types import coroutine
-from typing import Dict, Final
+from typing import Dict
 
 import aiohttp
 import requests
@@ -101,9 +101,9 @@ async def send_sse_message(id: str, json_data: Dict):
 
 
 class SSE():
-    SYS_STATUS: Final = "sys_status"
+    SYS_STATUS = "sys_status"
 
-    BTC_NETWORK_STATUS: Final = "btc_network_status"
-    BTC_MEMPOOL_STATUS: Final = "btc_mempool_status"
-    BTC_NEW_BLOC: Final = "btc_new_bloc"
-    BTC_INFO: Final = "btc_info"
+    BTC_NETWORK_STATUS = "btc_network_status"
+    BTC_MEMPOOL_STATUS = "btc_mempool_status"
+    BTC_NEW_BLOC = "btc_new_bloc"
+    BTC_INFO = "btc_info"
diff --git a/requirements.txt b/requirements.txt
index 73425ce..bcfac4c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,3 +15,4 @@ aiohttp==3.7.4
 grpcio==1.38.1
 grpcio-tools==1.38.1
 googleapis-common-protos==1.53.0
+protobuf>=3.12.0
\ No newline at end of file