diff --git a/requirements-frozen.txt b/requirements-frozen.txt
index 1b8f4d0..d49578a 100644
--- a/requirements-frozen.txt
+++ b/requirements-frozen.txt
@@ -18,5 +18,5 @@ sanic-jinja2==0.7.2
 ujson==1.35
 urllib3==1.24.2
 uvloop==0.11.3
-websockets==6.0
+websockets>=6.0,<7.0
 yarl==1.3.0