diff --git a/requirements.txt b/requirements.txt
index e0b023f..6377c05 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -320,7 +320,7 @@ traitlets==4.3.3
 transformers==2.8.0
 typed-ast==1.4.1
 typing-extensions==3.7.4.1
-ujson==1.35
+ujson==5.4.0
 unicodecsv==0.14.1
 uritemplate==3.0.1
 urllib3==1.25.7