diff --git a/scripts/update.sh b/scripts/update.sh
index e6ed58b7b..d0598135c 100644
--- a/scripts/update.sh
+++ b/scripts/update.sh
@@ -2,6 +2,9 @@
 # You can execute this file to update wallabag
 # eg: `sh update.sh prod`
 
+set -e
+set -u
+
 COMPOSER_COMMAND='composer'
 
 DIR="${BASH_SOURCE}"