diff --git a/requirements.txt b/requirements.txt
index 8712f72..39dd320 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -33,7 +33,7 @@ jupyter-core==4.4.0
 lazy-object-proxy==1.3.1
 MarkupSafe==1.0
 mccabe==0.6.1
-mistune==0.8.3
+mistune==2.0.3
 nbconvert==5.4.0
 nbformat==4.4.0
 nltk==3.4.5