diff --git a/requirements.txt b/requirements.txt
index 46c0dfa..347d6a7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -266,7 +266,7 @@ tornado==5.1.1
 tqdm==4.31.1
 traitlets==4.3.2
 typing==3.6.4
-ujson==1.35
+ujson==5.4.0
 unicodecsv==0.14.1
 uritemplate==3.0.0
 urllib3==1.24.2