Fixes #1636

telebot/asyncio_helper.py

@@ -1,5 +1,7 @@
 import asyncio # for future uses
+import ssl
 import aiohttp
+import certifi
 from telebot import types
 
 try:
@@ -27,11 +29,13 @@ REQUEST_LIMIT = 50
 class SessionManager:
     def __init__(self) -> None:
         self.session = None
+        self.ssl_context = ssl.create_default_context(cafile=certifi.where())
 
 
     async def create_session(self):
         self.session = aiohttp.ClientSession(connector=aiohttp.TCPConnector(
-            limit=REQUEST_LIMIT
+            limit=REQUEST_LIMIT,
+            ssl_context=self.ssl_context
         ))
         return self.session