diff --git a/api/controller/sdk.py b/api/controller/sdk.py
index a627702..ffa7cad 100644
--- a/api/controller/sdk.py
+++ b/api/controller/sdk.py
@@ -8,6 +8,7 @@
 from __future__ import print_function
 
 import os
+import sys
 
 from chromite.api import controller
 from chromite.api import faux
@@ -17,6 +18,9 @@
 from chromite.service import sdk
 
 
+assert sys.version_info >= (3, 6), 'This module requires Python 3.6+'
+
+
 def _ChrootVersionResponse(_input_proto, output_proto, _config):
   """Add a fake chroot version to a successful response."""
   output_proto.version.version = 168