diff --git a/requirements.txt b/requirements.txt
index 8e4b6a5..984702e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -45,7 +45,7 @@ termcolor==1.1.0
 thinc==6.10.1
 toolz==0.8.2
 tqdm==4.19.4
-ujson==1.35
+ujson==5.2.0
 uritemplate==3.0.0
 urllib3==1.22
 wcwidth==0.1.7