diff --git a/requirements.txt b/requirements.txt
index 18b2f25..30f1f0b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,6 +3,7 @@ aiohttp
 aiofiles
 peewee
 sanic-jinja2
+websockets<6.0
 
 # cli
 argh