diff --git a/requirements.txt b/requirements.txt
index 90d5382..8d2d1e6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -141,7 +141,7 @@ tornado==4.5.3
 tqdm==4.26.0
 traitlets==4.3.2
 tzlocal==1.5.1
-ujson==1.35
+ujson==5.2.0
 uritemplate==3.0.0
 urllib3==1.23
 virtualenv==15.1.0