diff --git a/requirements.txt b/requirements.txt
index 922f869..506fb01 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ jupyter-console==5.1.0
 jupyter-core==4.3.0
 MarkupSafe==1.0
 matplotlib==2.0.0
-mistune==0.7.4
+mistune==0.8.1
 nbconvert==5.1.1
 nbformat==4.3.0
 nltk==3.2.4