diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 48a7412..b094c2c
--- a/requirements.txt
+++ b/requirements.txt
@@ -112,7 +112,7 @@ tornado==4.5.1
 traitlets==4.3.2
 Twisted==17.5.0
 txaio==2.8.0
-ujson==1.35
+ujson==5.4.0
 universe==0.21.3
 urllib3==1.21.1
 virtualenv==15.1.0