diff --git a/2017/solutions/rllchatbot/requirements.txt b/2017/solutions/rllchatbot/requirements.txt
index d3da83a50..93828aa2b 100644
--- a/2017/solutions/rllchatbot/requirements.txt
+++ b/2017/solutions/rllchatbot/requirements.txt
@@ -62,7 +62,7 @@ Markdown==2.6.9
 MarkupSafe==1.0
 matplotlib==1.3.1
 mccabe==0.6.1
-mistune==0.7.4
+mistune==2.0.3
 mock==2.0.0
 murmurhash==0.26.4
 nbconvert==5.2.1