diff --git a/requirements.txt b/requirements.txt
index 802f8d4..26c1a45 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -152,7 +152,7 @@ pydicom==1.3.0
 pydot==1.4.1
 pydotplus==2.0.2
 pyflakes==1.6.0
-Pygments==2.2.0
+Pygments==2.7.4
 pylint==1.8.4
 pyodbc==4.0.23
 pyOpenSSL==18.0.0