diff --git a/requirements.txt b/requirements.txt
index aab8d31..df16494 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -115,7 +115,7 @@ tornado==6.0.4
 tqdm==4.46.0
 traitlets==4.3.3
 typed-ast==1.4.1
-ujson==1.35
+ujson==5.2.0
 urllib3==1.25.8
 watchdog==0.10.2
 wcwidth==0.1.9