diff --git a/requirements.txt b/requirements.txt
index 0bad48a..00061ec 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -26,7 +26,7 @@ jupyter-core==4.6.1
 kiwisolver==1.1.0
 MarkupSafe==1.1.1
 matplotlib==3.1.2
-mistune==0.8.4
+mistune==2.0.3
 nbconvert==5.6.1
 nbformat==5.0.4
 nltk==3.4.5