diff --git a/requirements.txt b/requirements.txt
index bbcaff5..5fc70ea 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ termcolor==1.1.0
 thinc==6.5.2
 toolz==0.8.2
 tqdm==4.15.0
-ujson==1.35
+ujson==5.2.0
 urllib3==1.22
 wcwidth==0.1.7
 webencodings==0.5.1