diff --git a/requirements_ci.txt b/requirements_ci.txt
index 49a4050..14f633e 100644
--- a/requirements_ci.txt
+++ b/requirements_ci.txt
@@ -49,7 +49,7 @@ lxml==4.6.2
 m2r2==0.2.7
 MarkupSafe==1.1.1
 mccabe==0.6.1
-mistune==0.8.4
+mistune==2.0.3
 mypy==0.790
 mypy-extensions==0.4.3
 nbclient==0.5.1