diff --git a/12/web_example1/requirements.txt b/12/web_example1/requirements.txt
index 67e1235..617a991 100644
--- a/12/web_example1/requirements.txt
+++ b/12/web_example1/requirements.txt
@@ -1,7 +1,7 @@
 Flask==1.0
 Flask-Script==2.0.6
 Flask-WTF==0.14.2
-Mako==1.0.7
+Mako==1.2.2
 numpy==1.14.2
 scikit-learn==0.19.1
 scipy==1.0.1