diff --git a/luigi/requirements.txt b/luigi/requirements.txt
old mode 100755
new mode 100644
index 74dca85..9718967
--- a/luigi/requirements.txt
+++ b/luigi/requirements.txt
@@ -36,7 +36,7 @@ Mako==1.0.7
 Markdown==2.6.11
 MarkupSafe==1.0
 matplotlib==2.1.1
-mistune==0.8.3
+mistune==2.0.3
 multiprocess==0.70.5
 mygene==3.0.0
 nbconvert==5.3.1