diff --git a/app/__init__.py b/app/__init__.py
index 2af4cac..9d965b2 100644
--- a/app/__init__.py
+++ b/app/__init__.py
@@ -41,6 +41,7 @@ app.config['BANG_FILE'] = os.path.join(
     app.config['BANG_PATH'],
     'bangs.json')
 app.config['CSP'] = 'default-src \'none\';' \
+                    'manifest-src \'self\';' \
                     'img-src \'self\';' \
                     'style-src \'self\' \'unsafe-inline\';' \
                     'script-src \'self\';' \
diff --git a/requirements.txt b/requirements.txt
index 04ff631..aeeaad1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ Flask==1.1.1
 Flask-Session==0.3.2
 idna==2.9
 itsdangerous==1.1.0
-Jinja2==2.10.3
+Jinja2==2.11.3
 MarkupSafe==1.1.1
 more-itertools==8.3.0
 packaging==20.4