diff --git a/docsrc/requirements.txt b/docsrc/requirements.txt
index dab372a..4b627f1 100644
--- a/docsrc/requirements.txt
+++ b/docsrc/requirements.txt
@@ -9,7 +9,7 @@ imagesize==1.1.0
 Jinja2==2.10.3
 m2r==0.2.1
 MarkupSafe==1.1.1
-mistune==0.8.4
+mistune==2.0.3
 packaging==19.2
 Pygments==2.5.2
 pyparsing==2.4.5