diff --git a/conf/celery-weblate.service b/conf/celery-weblate.service
index 337cf35..a033ad6 100644
--- a/conf/celery-weblate.service
+++ b/conf/celery-weblate.service
@@ -5,7 +5,7 @@ After=network.target
 [Service]
 Type=forking
 User=__APP__
-Group=__APP__
+Group=www-data
 PermissionsStartOnly=true
 EnvironmentFile=__FINALPATH__/celery-weblate
 WorkingDirectory=__FINALPATH__/
diff --git a/scripts/install b/scripts/install
index 1993684..5a34320 100755
--- a/scripts/install
+++ b/scripts/install
@@ -188,6 +188,7 @@ virtualenv --python=python3 "${final_path}/venv"
 	pip install --upgrade pip
 	# prevent error: "command: 'install_requires' must be a string or list of strings containing valid project/version requirement specifiers"
 	pip install --upgrade setuptools
+	pip install Django==2.2.*
 	pip install Weblate=="$current_version"
 	pip install pytz python-bidi PyYaML Babel pyuca pylibravatar py3dns psycopg2-binary phply django-redis hiredis aeidon ruamel.yaml
 	# specific to YunoHost package:
diff --git a/scripts/upgrade b/scripts/upgrade
index 17f36a3..72b96b7 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -181,6 +181,7 @@ ynh_script_progression --message="Install weblate using PIP..." --weight=10
 	pip install --upgrade pip
 	# prevent error: "command: 'install_requires' must be a string or list of strings containing valid project/version requirement specifiers"
 	pip install --upgrade setuptools
+	pip install Django==2.2.*
 	pip install Weblate=="$current_version"
 	pip install pytz python-bidi PyYaML Babel pyuca pylibravatar py3dns psycopg2-binary phply django-redis hiredis aeidon ruamel.yaml
 	# specific to YunoHost package: