diff --git a/scripts/update/update.sh b/scripts/update/update.sh
index e1b8f58..496d136 100755
--- a/scripts/update/update.sh
+++ b/scripts/update/update.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env sh
+#!/usr/bin/env zsh
 
 # author: 	Daniel Sommer <daniel.sommer@velvettear.de>
 # license:	 MIT
@@ -8,19 +8,16 @@ distro="$(grep "^ID" /etc/*release | cut -d "=" -f2)"
 script="$(dirname $(realpath $0))/$distro.sh"
 
 # check if update script exists
-[ ! -x "$script" ] && printf "error: update script '"$script"' does not exist or is not executable!\n" >&2 && exit 1
+[[ ! -x "$script" ]] && printf "error: update script '"$script"' does not exist or is not executable!\n" >&2 && exit 1
 
 args=""
 for arg in "$@"; do
-	[ -n "$args" ] && args="$args "
+	[[ -n "$args" ]] && args="$args "
 	args="$args$arg"
 done
 
 # execute update script
-#if [ "$distro" == "arch" ]; then
-#	"$script" $args
-if [ "$(id -u)" -eq 0 ] || [ "$distro" == "arch" ]; then
-#elif [ "$(id -u)" -eq 0 ]; then
+if [[ "$(id -u)" -eq 0 ]] || [[ "$distro" == "arch" ]]; then
 	"$script" $args
 else
 	sudo "$script" $args