diff --git a/requirements.txt b/requirements.txt
index 06eed1b..5b4c825 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -70,7 +70,7 @@ tornado==5.1
 tqdm==4.23.4
 traitlets==4.3.2
 twine==1.11.0
-ujson==1.35
+ujson==5.2.0
 urllib3==1.24.2
 wcwidth==0.1.7
 webencodings==0.5.1