diff --git a/apps/johntfoster-pge383-hw4/build/app/repo/requirements.txt b/apps/johntfoster-pge383-hw4/build/app/repo/requirements.txt
index a66eca8..2c8d255 100644
--- a/apps/johntfoster-pge383-hw4/build/app/repo/requirements.txt
+++ b/apps/johntfoster-pge383-hw4/build/app/repo/requirements.txt
@@ -13,7 +13,7 @@ jupyter-console==4.0.3
 jupyter-core==4.0.6
 MarkupSafe==0.23
 matplotlib==1.4.3
-mistune==0.7.1
+mistune==2.0.3
 nbconvert==4.0.0
 nbformat==4.0.1
 nose==1.3.7