diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 5270dc41..2f052edf
--- a/requirements.txt
+++ b/requirements.txt
@@ -55,7 +55,7 @@ kombu==4.1.0
 labkey==0.6.0
 lxml==4.2.1
 MarkupSafe==1.0
-mistune==0.8.3
+mistune==2.0.3
 msgpack-python==0.5.1
 nbconvert==5.3.1
 nbformat==4.4.0