diff --git a/zulip_bots/zulip_bots/run.py b/zulip_bots/zulip_bots/run.py
index 55dd80a..876f31c 100755
--- a/zulip_bots/zulip_bots/run.py
+++ b/zulip_bots/zulip_bots/run.py
@@ -10,8 +10,6 @@ from types import ModuleType
 from importlib import import_module
 from os.path import basename, splitext
 
-import six
-
 from zulip_bots.lib import run_message_handler_for_bot
 from zulip_bots.provision import provision_bot
 
@@ -21,7 +19,9 @@ def import_module_from_source(path, name=None):
     if not name:
         name = splitext(basename(path))[0]
 
-    if six.PY2:
+    # importlib.util.module_from_spec is supported from Python3.5
+    py_version = sys.version_info
+    if py_version.major < 3 or (py_version.major == 3 and py_version.minor < 5):
         import imp
         module = imp.load_source(name, path)
     else: