diff --git a/legacy/openCV/requirements.txt b/legacy/openCV/requirements.txt
index e709f4f..a59ddb6 100644
--- a/legacy/openCV/requirements.txt
+++ b/legacy/openCV/requirements.txt
@@ -27,7 +27,7 @@ kiwisolver==1.0.1
 Markdown==3.0.1
 MarkupSafe==1.0
 matplotlib==3.0.0
-mistune==0.8.4
+mistune==2.0.3
 nbconvert==5.4.0
 nbformat==4.4.0
 notebook==5.7.8