diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 319f5a3..505a8a7
--- a/requirements.txt
+++ b/requirements.txt
@@ -250,7 +250,7 @@ tornado==5.1.1
 tqdm==4.28.1
 traitlets==4.3.2
 Twisted==19.7.0
-ujson==1.35
+ujson==5.2.0
 unicodecsv==0.14.1
 UNKNOWN==0.0.0
 uritemplate==3.0.0