diff --git a/requirements.txt b/requirements.txt
index 0f37ba5..5cb808c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -107,7 +107,7 @@ testpath==0.5.0
 tornado==6.3.3
 traitlets==4.3.2
 typed-ast==1.4.1
-ujson==1.35
+ujson==5.4.0
 urllib3==1.26.18
 wcwidth==0.1.7
 webencodings==0.5.1