diff --git a/docs/examples/hook.sh b/docs/examples/hook.sh
index b7bd836..1823372 100755
--- a/docs/examples/hook.sh
+++ b/docs/examples/hook.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 deploy_challenge() {
     local DOMAIN="${1}" TOKEN_FILENAME="${2}" TOKEN_VALUE="${3}"