diff --git a/app.py b/app.py
index fa6cd0955b811aea5dc81cae35a118eb1d494967..0065a9e30e073df04b431c8a133f06385185de24 100644
--- a/app.py
+++ b/app.py
@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 from flask import Flask, render_template, Response, request
 import requests
 import json
diff --git a/requirements.txt b/requirements.txt
index 02fbf69dacf9becb4f590ff8a204179d99470620..989c9abd25db98eb657fd9a985fdf839db72331b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ Flask==1.0.2
 gunicorn==19.9.0
 Jinja2==2.10
 Click==7.0
-MarkupSafe==1.1.0
+MarkupSafe==1.1.1
 Werkzeug==0.14.1
 itsdangerous==1.1.0
 wheel==0.32.3
diff --git a/runtime.txt b/runtime.txt
index 1935e9778db66275403e99759f51768cc7599918..6aaad49f75b746e81aad5e854e142a0c01650225 100644
--- a/runtime.txt
+++ b/runtime.txt
@@ -1 +1 @@
-python-3.6.6
+python-3.6.15