diff --git a/requirements.txt b/requirements.txt
index 409c29df6..ea5403b0f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -26,7 +26,7 @@ jinja2==2.11.3; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2
 lektor==3.2.0
 markupsafe==1.1.1; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
 mccabe==0.6.1
-mistune==0.8.4
+mistune==2.0.3
 mypy-extensions==0.4.3
 pathspec==0.8.1
 pycodestyle==2.7.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'