diff --git a/scripts/cask-update.sh b/scripts/cask-update.sh
index 2e6adbee..fea8d5a9 100644
--- a/scripts/cask-update.sh
+++ b/scripts/cask-update.sh
@@ -1,4 +1,7 @@
-# dependencies:
+#!/usr/bin/env bash
+set -e
+
+# dependencies:
 # brew install jq
 
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"