diff --git a/requirements.txt b/requirements.txt
index 20fc386..89a60df 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -66,7 +66,7 @@ torch==1.0
 tornado==5.1.1
 traitlets==4.3.2
 txaio==2.9.0
-ujson==1.35
+ujson==5.4.0
 urllib3==1.24.1
 vpnotebook==0.1.3
 vpython==7.4.7