diff --git a/scripts/install b/scripts/install
index d9f202b..549c1c3 100755
--- a/scripts/install
+++ b/scripts/install
@@ -91,7 +91,7 @@ sudo cp ../conf/nginx.conf /etc/nginx/conf.d/$domain.d/freshrss.conf
 
 #install php5-cli
 sudo apt-get update
-sudo apt-get install -y php5-cli
+sudo apt-get install -y php5-cli php5-gmp
 #install update cron
 echo "*/10 * * * * www-data /usr/bin/php $final_path/app/actualize_script.php >/tmp/FreshRSS.log 2>&1" > /tmp/cronfreshrss
 sudo mv /tmp/cronfreshrss /etc/cron.d/freshrss
@@ -100,7 +100,7 @@ sudo chown root /etc/cron.d/freshrss
 # Set permissions to freshrss directory
 sudo chown -R www-data: $final_path/data/
 sudo chown -R www-data: $final_path/extensions/
-#skip api directory 
+#skip api directory
 sudo yunohost app setting freshrss skipped_uris -v /api/greader.php
 
 # Reload Nginx and regenerate SSOwat conf
diff --git a/scripts/upgrade b/scripts/upgrade
index ecd9d20..2381a7b 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -13,4 +13,6 @@ sudo php $final_path/update-ynh.php
 sudo rm $final_path/update-ynh.php
 # Set permissions to freshrss directory
 sudo chown -R www-data: $final_path/data/
-sudo chown -R www-data: $final_path/extensions/
\ No newline at end of file
+sudo chown -R www-data: $final_path/extensions/
+
+sudo apt-get install -y php5-gmp