diff --git a/requirements.txt b/requirements.txt
index 0fc8dfe32..daa4e3b6e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,5 +14,5 @@ pytz
 requests
 subliminal
 tzlocal
-urllib3
-waitress
\ No newline at end of file
+urllib3<1.23,>=1.21.1
+waitress