diff --git a/requirements.txt b/requirements.txt
index f444eafa5..0f4293260 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ Flask-Mail==0.9.1
 gevent
 greenlet
 gunicorn
-markdown
+mistletoe
 matplotlib
 Pillow
 psutil