diff --git a/scripts/upgrade b/scripts/upgrade
index c429a3b..b464c60 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -1,4 +1,116 @@
 #!/bin/bash
 
-echo "TODO"
-exit 1
\ No newline at end of file
+# Retrieve arguments
+domain=$(sudo yunohost app setting ghostblog domain)
+path=$(sudo yunohost app setting ghostblog path)
+path=${path%/}
+admin=$(sudo yunohost app setting ghostblog admin)
+password=$(sudo yunohost app setting ghostblog password)
+
+sudo service ynh-ghostblog stop
+
+final_path=/var/www/ghostblog
+
+version=0.5.0
+echo "Downloading Ghost $version..."
+mkdir ../tmp
+sudo wget -O ../tmp/ghost-$version.zip "https://en.ghost.org/zip/ghost-$version.zip"
+unzip ../tmp/ghost-$version.zip -d ../tmp/ghost
+
+echo "Saving content folder..."
+sudo cp -ar $final_path/ghost/content ../tmp
+
+echo "Deploying source files..."
+sudo rm -rf $final_path/ghost
+sudo cp -r ../tmp/ghost $final_path
+sudo cp -ar ../tmp/content $final_path/ghost
+#sudo cp ../conf/npm-shrinkwrap.json $final_path/ghost
+sudo chown -R ghostblog: $final_path
+
+echo "Installing Ghost with NPM..."
+#sudo su --shell /bin/bash --command "cd $final_path/ghost && npm install --production --registry http://registry.npmjs.eu" ghostblog
+sudo su --shell /bin/bash --command "cd $final_path/ghost && npm install --production --registry http://registry.npmjs.org" ghostblog
+
+echo "Cleaning up install tree..."
+sudo rm -rf $final_path/.npm
+find $final_path -type d | grep "test$" | xargs sudo rm -rf
+find $final_path -type d | grep "tests$" | xargs sudo rm -rf
+sudo rm -rf $final_path/ghost/node_modules/sqlite3/build
+sudo rm -rf $final_path/tmp
+
+echo "Patching sources to remove calls to googleapis..."
+# patches to core
+sudo cp $final_path/ghost/core/server/views/user-error.hbs $final_path/ghost/core/server/views/user-error.hbs.orig
+sudo cp $final_path/ghost/core/server/views/default.hbs $final_path/ghost/core/server/views/default.hbs.orig
+sudo cp $final_path/ghost/core/client/assets/css/fonts.css $final_path/ghost/core/client/assets/css/fonts.css.orig
+sudo sed -i '/googleapis/c\    <link rel="stylesheet" type="text/css" href="{{asset "css/fonts.css" ghost="true"}}">' $final_path/ghost/core/server/views/user-error.hbs
+sudo sed -i '/googleapis/c\    <link rel="stylesheet" type="text/css" href="{{asset "css/fonts.css" ghost="true"}}">' $final_path/ghost/core/server/views/default.hbs
+sudo cp ../patches/core/fonts.css $final_path/ghost/core/client/assets/css
+sudo cp ../patches/core/*.woff $final_path/ghost/core/client/assets/fonts
+# patches to casper theme
+#sudo cp $final_path/ghost/content/themes/casper/default.hbs $final_path/ghost/content/themes/casper/default.hbs.orig
+#sudo cp $final_path/ghost/content/themes/casper/assets/css/fonts.css $final_path/ghost/content/themes/casper/assets/css/fonts.css.orig
+#sudo sed -i '/googleapis/c\    <link rel="stylesheet" type="text/css" href="{{asset "css/fonts.css"}}">' $final_path/ghost/content/themes/casper/default.hbs
+#sudo cp ../patches/theme/fonts.css $final_path/ghost/content/themes/casper/assets/css
+#sudo cp ../patches/theme/*.woff $final_path/ghost/content/themes/casper/assets/fonts
+
+echo "Setting up permissions"
+sudo chown -R ghostblog: $final_path/ghost
+
+echo "Setting up database..."
+db_name=ghostblog
+db_user=ghostblog
+db_pwd=$(sudo yunohost app setting ghostblog mysqlpwd)
+# db_pwd=$(dd if=/dev/urandom bs=1 count=200 2> /dev/null | tr -c -d '[A-Za-z0-9]' | sed -n 's/\(.\{24\}\).*/\1/p')
+# sudo yunohost app initdb $db_user -d $db_name -p $db_pwd
+# sudo yunohost app setting ghostblog mysqlpwd -v $db_pwd
+
+echo "Deploying configuration..."
+sed -i "s@YNH_DOMAIN@$domain@g" ../conf/config.js
+sed -i "s@YNH_LOCATION@${path%/}@g" ../conf/config.js
+sed -i "s@YNH_DBNAME@$db_name@g" ../conf/config.js
+sed -i "s@YNH_DBUSER@$db_user@g" ../conf/config.js
+sed -i "s@YNH_DBPWD@$db_pwd@g" ../conf/config.js
+sudo cp ../conf/config.js $final_path/ghost
+sudo chown ghostblog: $final_path/ghost/config.js
+sudo chmod 644 $final_path/ghost/config.js
+
+echo "Setting up init script..."
+logfile=/var/log/ynh-ghostblog.log
+sudo touch $logfile
+sudo chown ghostblog: $logfile
+
+sed -i "s@YNH_FINALPATH@$final_path@g" ../conf/init-script
+sed -i "s@YNH_LOGFILE@$logfile@g" ../conf/init-script
+sudo cp ../conf/init-script /etc/init.d/ynh-ghostblog
+sudo chmod +x /etc/init.d/ynh-ghostblog
+sudo update-rc.d ynh-ghostblog defaults
+sudo service ynh-ghostblog start
+sudo yunohost service add ynh-ghostblog -l $logfile
+
+echo "Setting up logrotate configuration..."
+sed -i "s@YNH_LOGFILE@$logfile@g" ../conf/logrotate
+sudo cp ../conf/logrotate /etc/logrotate.d/ynh-ghostblog
+
+echo "Nginx configuration (sso disabled)..."
+sed -i "s@YNH_LOCATION@$path@g" ../conf/nginx.conf
+sudo cp ../conf/nginx.conf /etc/nginx/conf.d/$domain.d/ghostblog.conf
+sudo yunohost app setting ghostblog skipped_uris -v "/"
+
+echo "Reloading Nginx (sso disabled)..."
+sudo service nginx reload
+sudo yunohost app ssowatconf
+
+# echo "Registering admin..."
+# admin_name=$(sudo yunohost user list --json | python ../conf/user_getname.py $admin)
+# admin_mail=$(sudo yunohost user list --json | python ../conf/user_getmail.py $admin)
+# curl -kL -X POST http://localhost:2368${path%/}/ghost/api/v0.1/authentication/setup/ \
+#   --data-urlencode "setup[0][name]=$admin_name" \
+#   --data-urlencode "setup[0][email]=$admin_mail" \
+#   --data-urlencode "setup[0][password]=$password" \
+#   --data-urlencode "setup[0][blogTitle]=My Yunohost blog"
+# 
+# sudo yunohost app setting ghostblog admin -v $admin
+# sudo yunohost app setting ghostblog password -v $password
+
+echo "Success ! You can go to https://$domain$path/ghost to write your posts"