diff --git a/test/kokoro.sh b/test/kokoro.sh
index 38ea41b2..667db112 100755
--- a/test/kokoro.sh
+++ b/test/kokoro.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # Copyright 2017 gRPC authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/tools/release/kokoro-electron.sh b/tools/release/kokoro-electron.sh
index 721b9c97..fd833503 100755
--- a/tools/release/kokoro-electron.sh
+++ b/tools/release/kokoro-electron.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # Copyright 2018 gRPC authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/tools/release/kokoro-nodejs.sh b/tools/release/kokoro-nodejs.sh
index 7dd89c89..7ce0a0b6 100755
--- a/tools/release/kokoro-nodejs.sh
+++ b/tools/release/kokoro-nodejs.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # Copyright 2018 gRPC authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");