diff --git a/requirements_novenv.txt b/requirements_novenv.txt
index 6df27b6..09886d8 100644
--- a/requirements_novenv.txt
+++ b/requirements_novenv.txt
@@ -116,7 +116,7 @@ MarkupSafe==1.0
 marshmallow==3.2.1
 matplotlib==2.0.2
 mccabe==0.6.1
-mistune==0.7.4
+mistune==0.8.1
 mpmath==0.19
 msgpack-python==0.4.8
 multipledispatch==0.4.9