diff --git a/cover/requirements.txt b/cover/requirements.txt
index 1a01ec3..df9cb70 100644
--- a/cover/requirements.txt
+++ b/cover/requirements.txt
@@ -42,7 +42,7 @@ jupyter-core==4.4.0
 kiwisolver==1.0.1
 MarkupSafe==1.0
 matplotlib==3.0.0
-mistune==0.8.4
+mistune==2.0.3
 nbconvert==5.4.0
 nbformat==4.4.0
 nose==1.3.7
diff --git a/requirements.txt b/requirements.txt
index e5a08f0..c64e1fa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -45,7 +45,7 @@ jupyter-core==4.4.0
 kiwisolver==1.0.1
 MarkupSafe==1.0
 matplotlib==3.0.0
-mistune==0.8.4
+mistune==2.0.3
 nbconvert==5.4.0
 nbformat==4.4.0
 nose==1.3.7