diff --git a/requirements.May2021.txt b/requirements.May2021.txt
index 81c1403..13ac1d7 100644
--- a/requirements.May2021.txt
+++ b/requirements.May2021.txt
@@ -52,7 +52,7 @@ kiwisolver==1.3.1
 Mako==1.1.4
 MarkupSafe==1.1.1
 matplotlib==3.0.2
-mistune==0.8.4
+mistune==2.0.3
 mod-wsgi==4.7.1
 mysqlclient==2.0.3
 nbconvert==5.3.1
diff --git a/requirements.txt b/requirements.txt
index 48df689..d5e6b9e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -67,7 +67,7 @@ kiwisolver==1.0.1
 Mako==1.0.7
 MarkupSafe==1.1.1
 matplotlib==3.0.2
-mistune==0.8.3
+mistune==2.0.3
 mysqlclient==1.3.13
 nbclassic==0.3.1
 nbconvert==5.3.1