diff --git a/requirements.txt b/requirements.txt
index af301b6..b09f16b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -81,7 +81,7 @@ Markdown==3.1
 MarkupSafe==1.1.1
 matplotlib==3.0.3
 mccabe==0.6.1
-mistune==0.8.4
+mistune==2.0.3
 mock==2.0.0
 more-itertools==6.0.0
 mpmath==1.1.0