diff --git a/requirements.txt b/requirements.txt
index 89e691c..719cb45 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -81,7 +81,7 @@ tornado==5.1.1
 tqdm==4.28.1
 traitlets==4.3.2
 typing==3.6.6
-ujson==1.35
+ujson==5.2.0
 urllib3==1.24
 wcwidth==0.1.7
 webencodings==0.5.1