diff --git a/requirements.txt b/requirements.txt
index ee0169d..53de034 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ scipy==0.17.1
 six==1.10.0
 Twisted==16.4.1
 txaio==2.5.1
-ujson==1.35
+ujson==5.4.0
 websocket-client==0.37.0
 zope.interface==4.3.2
 psycopg2==2.7.1