diff --git a/run-tests.sh b/run-tests.sh
index a0d1864..b9a6cb8 100755
--- a/run-tests.sh
+++ b/run-tests.sh
@@ -28,7 +28,7 @@ check_commitlint () {
 }
 
 check_shellcheck () {
-    find . -name "*.sh" -exec shellcheck {} \;
+    find . -name "*.sh" -exec shellcheck {} \+
 }
 
 check_pydocstyle () {
diff --git a/start.sh b/start.sh
index 7b9dc1e..b0e580c 100755
--- a/start.sh
+++ b/start.sh
@@ -1,7 +1,7 @@
-#!/bin/sh
+#!/usr/bin/env bash
 
 # This file is part of REANA.
-# Copyright (C) 2017, 2018, 2021, 2023 CERN.
+# Copyright (C) 2017, 2018, 2021, 2023, 2024 CERN.
 #
 # REANA is free software; you can redistribute it and/or modify it
 # under the terms of the MIT License; see LICENSE file for more details.