diff --git a/scripts/_common.sh b/scripts/_common.sh
index 3a4b407..39c9cc6 100755
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -10,6 +10,7 @@ synapse_version="0.22.0"
 install_dependances() {
 	ynh_install_app_dependencies coturn build-essential python2.7-dev libffi-dev python-pip python-setuptools sqlite3 libssl-dev python-virtualenv libjpeg-dev libpq-dev postgresql
 	pip install --upgrade pip
+	pip install --upgrade cffi
 	pip install --upgrade ndg-httpsclient
 	pip install --upgrade virtualenv
 }