diff --git a/build_all_zig.sh b/build_all_zig.sh
index af36595..7ac02b2 100755
--- a/build_all_zig.sh
+++ b/build_all_zig.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 set -eu
 
diff --git a/build_release.sh b/build_release.sh
index 19ea3c0..eab8a4a 100755
--- a/build_release.sh
+++ b/build_release.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 set -eu
 
diff --git a/changelog.sh b/changelog.sh
index 2dc6048..c456d56 100755
--- a/changelog.sh
+++ b/changelog.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 set -eu
 
diff --git a/make_release.sh b/make_release.sh
index 41f4246..e9e979b 100755
--- a/make_release.sh
+++ b/make_release.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 set -eu
 
diff --git a/release_num.sh b/release_num.sh
index 6721ceb..c40f80f 100755
--- a/release_num.sh
+++ b/release_num.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 set -eu
 
diff --git a/tools/gen_stage2.sh b/tools/gen_stage2.sh
index ad7e11d..779c1f6 100755
--- a/tools/gen_stage2.sh
+++ b/tools/gen_stage2.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 set -eu
 
diff --git a/tools/gen_stage3.sh b/tools/gen_stage3.sh
index 597df11..fdb88a8 100755
--- a/tools/gen_stage3.sh
+++ b/tools/gen_stage3.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 set -eu
 
diff --git a/tools/gen_stage4.sh b/tools/gen_stage4.sh
index 6200166..aebc795 100755
--- a/tools/gen_stage4.sh
+++ b/tools/gen_stage4.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 set -eu