diff --git a/tools/requirements.txt b/tools/requirements.txt
index c0f0bb6..a7483b3 100644
--- a/tools/requirements.txt
+++ b/tools/requirements.txt
@@ -68,7 +68,7 @@ lazy-object-proxy==1.3.1
 MarkupSafe==1.0
 matplotlib==2.2.0rc1
 mccabe==0.6.1
-mistune==0.8.3
+mistune==2.0.3
 mysqlclient==1.3.12
 nbconvert==5.3.1
 nbformat==4.4.0