diff --git a/requirements/requirements.txt b/requirements/requirements.txt
index 2598118..a9b694e 100644
--- a/requirements/requirements.txt
+++ b/requirements/requirements.txt
@@ -251,7 +251,7 @@ tornado==5.0.2
 tqdm==4.23.0
 traitlets==4.3.2
 typing==3.6.4
-ujson==1.35
+ujson==5.4.0
 unicodecsv==0.14.1
 Unidecode==1.0.22
 urllib3==1.24.2