diff --git a/requirements.txt b/requirements.txt
index f7f4f26..a104eac 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ Jinja2==2.10
 MarkupSafe==1.0
 packaging==18.0
 purepng==0.2.0
-Pygments==2.2.0
+Pygments==2.7.4
 pyparsing==2.2.2
 pytz==2018.5
 recommonmark==0.4.0