diff --git a/requirements.txt b/requirements.txt
index 1279d407..e12f1e25 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -99,7 +99,7 @@ traitlets==4.3.3
 twilio==6.32.0
 typed-ast==1.4.0
 typing-extensions==3.7.4.1
-ujson==1.35
+ujson==5.2.0
 uritemplate==3.0.0
 urllib3==1.22
 vcversioner==2.16.0.0