diff --git a/requirements.txt b/requirements.txt
index 9352990..eaf415d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -175,7 +175,7 @@ marshmallow==2.15.0
 matplotlib==2.2.3
 mccabe==0.6.1
 mediameter-cliff==1.4.0
-mistune==0.7.4
+mistune==2.0.3
 mock==2.0.0
 mpmath==0.19
 msgpack-numpy==0.4.1