diff --git a/scripts/install b/scripts/install
index f301ad2..80e81fe 100644
--- a/scripts/install
+++ b/scripts/install
@@ -102,7 +102,7 @@ ynh_install_app_dependencies $pkg_dependencies
 if [ $YNH_ARCH == "armhf" ] 
 then
 	ynh_script_progression --message="Installing specific arm dependencies..."
-	ynh_install_extra_app_dependencies --repo="deb http://security.debian.org/debian-security stretch/updates main" --package="$pkg_extra_depedencies_arm"
+	ynh_install_extra_app_dependencies --repo="deb http://security.debian.org/debian-security stretch/updates main" --package="$pkg_extra_depedencies_arm" --key="https://ftp-master.debian.org/keys/archive-key-9-security.asc"
 fi
 
 
diff --git a/scripts/upgrade b/scripts/upgrade
index 0cf8379..1480702 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -148,7 +148,7 @@ ynh_install_app_dependencies $pkg_dependencies
 if [ $YNH_ARCH == "armhf" ] 
 then
 	ynh_script_progression --message="Installing specific arm dependencies..."
-	ynh_install_extra_app_dependencies --repo="deb http://security.debian.org/debian-security stretch/updates main" --package="$pkg_extra_depedencies_arm"
+	ynh_install_extra_app_dependencies --repo="deb http://security.debian.org/debian-security stretch/updates main" --package="$pkg_extra_depedencies_arm" --key="https://ftp-master.debian.org/keys/archive-key-9-security.asc"
 fi
 
 if ! yunohost app list | grep -q "prosody"