diff --git a/slack/webhook-for-challenge/src/requirements.txt b/slack/webhook-for-challenge/src/requirements.txt
old mode 100755
new mode 100644
index 84b3e34..3407696
--- a/slack/webhook-for-challenge/src/requirements.txt
+++ b/slack/webhook-for-challenge/src/requirements.txt
@@ -9,7 +9,7 @@ Flask-Script==2.0.6
 Flask-SQLAlchemy==2.3.2
 idna==2.6
 itsdangerous==0.24
-Jinja2==2.10
+Jinja2==2.11.3
 Mako==1.0.7
 MarkupSafe==1.0
 marshmallow==2.15.1