diff --git a/requirements.txt b/requirements.txt
index 301dbfa..8991a1a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -108,7 +108,7 @@ toolz==0.9.0
 tornado==5.1.1
 tqdm==4.28.1
 traitlets==4.3.2
-ujson==1.35
+ujson==5.4.0
 uritemplate==3.0.0
 urllib3==1.23
 wcwidth==0.1.7