diff --git a/docs/requirements.txt b/docs/requirements.txt
index 0d7bd36..5218a63 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -8,7 +8,7 @@ Jinja2==2.8.1
 MarkupSafe==0.23
 nilsimsa==0.3.8
 packaging==16.8
-Pygments==2.1.3
+Pygments==2.7.4
 pyparsing==2.1.10
 pytz==2016.10
 readthedocs-sphinx-ext==0.5.4