diff --git a/requirements.txt b/requirements.txt
index b90116e..5739d29 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ itsdangerous==1.1.0
 Jinja2==2.10
 jsonschema==2.6.0
 MarkupSafe==1.1.0
-mistune==0.8.4
+mistune==2.0.3
 more-itertools==4.3.0
 pluggy==0.8.0
 py==1.7.0