diff --git a/requirements.txt b/requirements.txt
index b09f369..e02c2f6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -36,7 +36,7 @@ termcolor==1.1.0
 thinc==6.10.2
 toolz==0.9.0
 tqdm==4.23.0
-ujson==1.35
+ujson==5.2.0
 urllib3==1.22
 wrapt==1.10.11
 xgboost==0.71