diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 76a999c..bddd204
--- a/requirements.txt
+++ b/requirements.txt
@@ -59,7 +59,7 @@ thinc==6.10.2
 toolz==0.9.0
 tqdm==4.19.5
 traitlets==4.3.2
-ujson==1.35
+ujson==5.4.0
 urllib3==1.22
 uWSGI==2.0.15
 wcwidth==0.1.7