diff --git a/build/tools/post-release.sh b/build/tools/post-release.sh
index 290397c37c..79e412d56b 100755
--- a/build/tools/post-release.sh
+++ b/build/tools/post-release.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # Exit immediately if a command exits with a non-zero status.
 set -e
diff --git a/build/tools/pre-release.sh b/build/tools/pre-release.sh
index 252c2cd9bf..4a3406e1cf 100755
--- a/build/tools/pre-release.sh
+++ b/build/tools/pre-release.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # build a list of English locales
 declare -a locale_list=("en_GB" "en_US")