diff --git a/requirements_dev.txt b/requirements_dev.txt
index 53f4809..24f9d43 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -57,7 +57,7 @@ libroadrunner==2.0.4
 markupsafe==1.1.1; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
 matplotlib==3.3.3; python_version >= '3.6'
 mccabe==0.6.1
-mistune==0.8.4
+mistune==2.0.3
 mypy-extensions==0.4.3
 mypy==0.790
 nbclient==0.5.1; python_version >= '3.6'