diff --git a/scripts/clone-manifest.sh b/scripts/clone-manifest.sh
index 82bf4803..065378cd 100644
--- a/scripts/clone-manifest.sh
+++ b/scripts/clone-manifest.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 # clone-manifest.sh — clone all repos listed in manifest.json into their
 # target directories. Replaces hardcoded git-clone lines in Dockerfiles.
 #