diff --git a/requirements.txt b/requirements.txt
index b9ce84d..4c002ca 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -50,7 +50,7 @@ llvmlite==0.28.0
 Markdown==3.0.1
 MarkupSafe==1.1.1
 matplotlib==2.2.3
-mistune==0.8.4
+mistune==2.0.3
 mock==2.0.0
 more-itertools==5.0.0
 mpmath==1.1.0