diff --git a/doc/requirements.txt b/doc/requirements.txt
index 0c9c95a..8d56634 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -10,7 +10,7 @@ Jinja2==2.8
 livereload==2.4.1
 MarkupSafe==0.23
 pathtools==0.1.2
-Pygments==2.1.1
+Pygments==2.7.4
 pytz==2015.7
 PyYAML==3.11
 recommonmark==0.4.0