diff --git a/regression/externalTools/MARS/requirements.txt b/regression/externalTools/MARS/requirements.txt
index 3f6c83c..8d5c8c1 100644
--- a/regression/externalTools/MARS/requirements.txt
+++ b/regression/externalTools/MARS/requirements.txt
@@ -79,7 +79,7 @@ lxml==3.6.0
 MarkupSafe==0.23
 matplotlib==1.5.1
 mechanize==0.2.5
-mistune==0.7.2
+mistune==0.8.1
 mpmath==0.19
 msgpack-python==0.4.8
 multipledispatch==0.4.8