diff --git a/requirements.txt b/requirements.txt
index 88b8fec..38af35e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -53,7 +53,7 @@ toml==0.10.2
 tornado==6.1
 traitlets==5.0.5
 typing-extensions==3.7.4.3
-ujson==1.35
+ujson==5.4.0
 urllib3==1.25.11
 vine==1.3.0
 watchdog==0.10.4