diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 9c903fa..dffa96b
--- a/requirements.txt
+++ b/requirements.txt
@@ -47,7 +47,7 @@ Keras==2.1.2
 Markdown==2.6.9
 MarkupSafe==1.0
 matplotlib==2.0.0
-mistune==0.7.3
+mistune==0.8.1
 mock==2.0.0
 moviepy==0.2.2.1
 nbconvert==5.1.1