diff --git a/docs/requirements.txt b/docs/requirements.txt
index 2f6c162..ec3c2bc 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -2,7 +2,7 @@ Jinja2==2.10.1
 Markdown==3.0.1
 MarkupSafe==0.23
 pyyaml==4.2b1
-Pygments==2.3.1
+Pygments==2.7.4
 argparse==1.2.1
 backports-abc==0.4
 backports.ssl-match-hostname==3.5.0.1