diff --git a/docs/requirements.txt b/docs/requirements.txt
index 3a0bafd..5c55338 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -25,7 +25,7 @@ lxml==4.2.3
 MarkupSafe==1.0
 packaging==17.1
 pycparser==2.18
-Pygments==2.2.0
+Pygments==2.7.4
 PyMySQL==0.9.2
 pyparsing==2.2.0
 pytz==2018.5