diff --git a/requirements.txt b/requirements.txt
index 05c6126..fa17b97 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -52,7 +52,7 @@ six==1.10.0
 testpath==0.3
 tornado==4.5.1
 traitlets==4.3.2
-ujson==1.35
+ujson==5.4.0
 urllib3==1.22
 wcwidth==0.1.7
 Werkzeug==0.12.2