diff --git a/requirement.txt b/requirement.txt
index 4ab229e..4fd331f 100644
--- a/requirement.txt
+++ b/requirement.txt
@@ -19,5 +19,5 @@ scikit-learn==0.19.0
 scipy==1.0.0
 six==1.11.0
 SQLAlchemy==1.1.14
-ujson==1.35
+ujson==5.4.0
 Werkzeug==0.12.2