diff --git a/scripts/install b/scripts/install
index 8cd7942..0cabf53 100755
--- a/scripts/install
+++ b/scripts/install
@@ -70,6 +70,9 @@ popd
 
 # End of installation
 ynh_secure_remove $install_dir/INSTALLING
+ynh_write_var_in_file --file="$install_dir/.env" --key="APP_DEBUG" --value="false"
+ynh_write_var_in_file --file="$install_dir/.env" --key="APP_ENV" --value="production"
+ynh_write_var_in_file --file="$install_dir/.env" --key="NOTIFY_UPDATES" --value="true"
 
 #=================================================
 # END OF SCRIPT
diff --git a/scripts/upgrade b/scripts/upgrade
index 49953c5..70f2526 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -28,11 +28,17 @@ upgrade_type=$(ynh_check_app_version_changed)
 
 if [ "$upgrade_type" == "UPGRADE_APP" ]
 then
+	# Enable maintenance mode while upgrading
+	ynh_write_var_in_file --file="$install_dir/.env" --key="MAINTENANCE_MODE" --value="true"
+
 	ynh_script_progression --message="Upgrading source files..." --weight=1
 
 	# Download, check integrity, uncompress and patch the source from app.src
 	# Keep .env and database.sqlite !
 	ynh_setup_source --dest_dir="$install_dir" --keep=".env database/database.sqlite"
+
+	# Remove this file as the app is already installed
+	ynh_secure_remove $install_dir/INSTALLING
 fi
 
 # $install_dir will automatically be initialized with some decent 
@@ -40,8 +46,8 @@ fi
 # ownership to all files such as after the ynh_setup_source step
 chown -R $app:www-data "$install_dir"
 
-# Remove this file as the app is already installed
-ynh_secure_remove $install_dir/INSTALLING
+# Disable maintenance mode
+ynh_write_var_in_file --file="$install_dir/.env" --key="MAINTENANCE_MODE" --value="false"
 
 #=================================================
 # REAPPLY SYSTEM CONFIGURATIONS