diff --git a/requirements.txt b/requirements.txt
index 7d96359..9e25d8c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -118,7 +118,7 @@ torchvision==0.5.0
 tornado==6.0.4
 tqdm==4.43.0
 traitlets==4.3.3
-ujson==1.35
+ujson==5.2.0
 urllib3==1.23
 virtualenv==16.0.0
 wcwidth==0.1.8