diff --git a/prepare_hundredwatt.sh b/prepare_hundredwatt.sh
index 90a0a42..ef131d3 100755
--- a/prepare_hundredwatt.sh
+++ b/prepare_hundredwatt.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #
 #  Copyright 2023 The original authors
 #
@@ -15,6 +15,5 @@
 #  limitations under the License.
 #
 
-
 source "$HOME/.sdkman/bin/sdkman-init.sh"
 sdk use java 21.0.1-graal
diff --git a/prepare_kuduwa-keshavram.sh b/prepare_kuduwa-keshavram.sh
index a705f17..f83a3ff 100755
--- a/prepare_kuduwa-keshavram.sh
+++ b/prepare_kuduwa-keshavram.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #
 #  Copyright 2023 The original authors
 #
diff --git a/prepare_mtopolnik.sh b/prepare_mtopolnik.sh
index a705f17..f83a3ff 100755
--- a/prepare_mtopolnik.sh
+++ b/prepare_mtopolnik.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #
 #  Copyright 2023 The original authors
 #
diff --git a/prepare_ricardopieper.sh b/prepare_ricardopieper.sh
index a705f17..f83a3ff 100755
--- a/prepare_ricardopieper.sh
+++ b/prepare_ricardopieper.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #
 #  Copyright 2023 The original authors
 #
diff --git a/prepare_roman-r-m.sh b/prepare_roman-r-m.sh
index 6a33e2b..f83a3ff 100755
--- a/prepare_roman-r-m.sh
+++ b/prepare_roman-r-m.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #
 #  Copyright 2023 The original authors
 #
@@ -16,4 +16,4 @@
 #
 
 source "$HOME/.sdkman/bin/sdkman-init.sh"
-sdk use java 21.0.1-graal 1>&2
\ No newline at end of file
+sdk use java 21.0.1-graal 1>&2