diff --git a/cli/requirements.txt b/cli/requirements.txt
index b4336fa..aa0f354 100644
--- a/cli/requirements.txt
+++ b/cli/requirements.txt
@@ -114,7 +114,7 @@ testpath==0.4.2
 toolz==0.9.0
 tornado==6.0.2
 traitlets==4.3.2
-ujson==1.35
+ujson==5.4.0
 urllib3==1.24.2
 wcwidth==0.1.7
 webencodings==0.5.1