diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index df82c2f..72d542a
--- a/requirements.txt
+++ b/requirements.txt
@@ -119,7 +119,7 @@ toolz==0.9.0
 tornado==5.0.1
 tqdm==4.20.0
 traitlets==4.3.2
-ujson==1.35
+ujson==5.4.0
 urllib3==1.22
 uvloop==0.9.1
 wcwidth==0.1.7