diff --git a/requirements/heroku.txt b/requirements/heroku.txt
index 40a885c..340e0b6 100644
--- a/requirements/heroku.txt
+++ b/requirements/heroku.txt
@@ -25,7 +25,7 @@ Jinja2==2.9.6
 Mako==1.0.7
 Markdown==3.0.1
 MarkupSafe==1.0
-Pygments==2.3.1
+Pygments==2.7.4
 python-dateutil==2.6.1
 python-editor==1.0.3
 requests==2.21.0