diff --git a/requirements.txt b/requirements.txt
index b8e3611..50abb53 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -151,7 +151,7 @@ toolz==0.9.0
 tornado==4.5.3
 tqdm==4.28.1
 traitlets==4.3.2
-ujson==1.35
+ujson==5.4.0
 urllib3==1.23
 wcwidth==0.1.7
 websocket-client==0.54.0