diff --git a/pip-requirements.txt b/pip-requirements.txt
index 315ace5..eb02daf 100644
--- a/pip-requirements.txt
+++ b/pip-requirements.txt
@@ -57,7 +57,7 @@ lxml==3.5.0
 Markdown==2.6.8
 MarkupSafe==1.0
 matplotlib==2.0.2
-mistune==0.7.4
+mistune==0.8.1
 mock==2.0.0
 Morfessor==2.0.2a4
 mpld3==0.3