diff --git a/zulip/zulip/__init__.py b/zulip/zulip/__init__.py
index e2efe4d..99a7c8d 100644
--- a/zulip/zulip/__init__.py
+++ b/zulip/zulip/__init__.py
@@ -1,4 +1,3 @@
-#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 import json
@@ -22,6 +21,9 @@ from typing import Any, Callable, Dict, Iterable, IO, List, Mapping, Optional, T
 
 __version__ = "0.6.4"
 
+# Ensure the Python version is supported
+assert sys.version_info >= (3, 5)
+
 logger = logging.getLogger(__name__)
 
 # Check that we have a recent enough version