diff --git a/requirements.txt b/requirements.txt
index c778822..2ba94cb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,7 +23,7 @@ jinja2==2.10.1
 jsonlines==1.2.0
 jsonschema==2.6.0
 markupsafe==1.1.1
-mistune==0.8.4
+mistune==2.0.3
 netaddr==0.7.19
 ocspbuilder==0.10.2
 oscrypto==0.19.1