diff --git a/requirements.txt b/requirements.txt
index a21bb4d..0cb35f0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ itsdangerous==1.1.0
 Jinja2==2.10
 jsonschema==2.6.0
 MarkupSafe==1.1.0
-mistune==0.8.4
+mistune==2.0.3
 openapi-spec-validator==0.2.4
 PyJWT==1.6.4
 pytz==2018.7