diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 14be3a8..4c94101
--- a/requirements.txt
+++ b/requirements.txt
@@ -49,7 +49,7 @@ lxml==4.2.3
 Markdown==2.6.11
 MarkupSafe==1.0
 matplotlib==2.2.2
-mistune==0.8.3
+mistune==2.0.3
 more-itertools==4.2.0
 msgpack-numpy==0.4.1
 msgpack-python==0.5.4