diff --git a/src/http_server/requirements.txt b/src/http_server/requirements.txt
index bb757a2..5a915d0 100644
--- a/src/http_server/requirements.txt
+++ b/src/http_server/requirements.txt
@@ -25,7 +25,7 @@ jupyter-client==5.3.4
 jupyter-console==6.0.0
 jupyter-core==4.6.1
 MarkupSafe==1.1.1
-mistune==0.8.4
+mistune==2.0.3
 more-itertools==8.1.0
 nbconvert==5.6.1
 nbformat==5.0.3