diff --git a/tests/fixtures/bare_repo.sh b/tests/fixtures/bare_repo.sh
index d42c782a8..be00e49dd 100644
--- a/tests/fixtures/bare_repo.sh
+++ b/tests/fixtures/bare_repo.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -eu -o pipefail
 
 git init -q --bare
diff --git a/tests/fixtures/basic_repo.sh b/tests/fixtures/basic_repo.sh
index 3734f7689..0b213e749 100644
--- a/tests/fixtures/basic_repo.sh
+++ b/tests/fixtures/basic_repo.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -eu -o pipefail
 
 git init -q
diff --git a/tests/fixtures/repo.sh b/tests/fixtures/repo.sh
index 3d4f71528..0fc446e9c 100644
--- a/tests/fixtures/repo.sh
+++ b/tests/fixtures/repo.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -eu -o pipefail
 
 git init -q