diff --git a/lib/py/requirements.txt b/lib/py/requirements.txt
index 7cf8b31..2254a28 100644
--- a/lib/py/requirements.txt
+++ b/lib/py/requirements.txt
@@ -1,3 +1,3 @@
 six
-backports.ssl_match_hostname
+backports.ssl_match_hostname >= 3.5
 ipaddress