diff --git a/CPU_Mac_Requirements.txt b/CPU_Mac_Requirements.txt
index 2b3f3d1..c017769 100644
--- a/CPU_Mac_Requirements.txt
+++ b/CPU_Mac_Requirements.txt
@@ -54,7 +54,7 @@ matplotlib==3.1.0
 matplotlib-base==3.1.0
 mccabe==0.6.1
 medpy==0.4.0
-mistune==0.8.4
+mistune==2.0.3
 mock==3.0.5
 nbconvert==5.5.0
 nbformat==4.4.0