diff --git a/requirements.txt b/requirements.txt
index 46a2195..ba79bfe 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ itsdangerous==1.1.0
 Jinja2==2.10
 jsonschema==3.0.1
 MarkupSafe==1.1.1
-mistune==0.8.4
+mistune==2.0.3
 networkx==2.2
 pyrsistent==0.14.11
 pytz==2018.9