diff --git a/docs/requirements.txt b/docs/requirements.txt
index 3b31ed3..faf20ea 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -10,7 +10,7 @@ Jinja2==2.10.1
 MarkupSafe==1.0
 packaging==18.0
 pbr==5.1.0
-Pygments==2.2.0
+Pygments==2.7.4
 pyparsing==2.2.2
 pytz==2018.5
 requests==2.20.0