diff --git a/requirements.txt b/requirements.txt
index 252c751..c20af18 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,7 +30,7 @@ termcolor==1.1.0
 thinc==6.10.2
 toolz==0.9.0
 tqdm==4.19.5
-ujson==1.35
+ujson==5.2.0
 urllib3==1.22
 wcwidth==0.1.7
 webencodings==0.5.1