diff --git a/testing/sdk.sh b/testing/sdk.sh
index b1fb3ea1d..51a3ab232 100644
--- a/testing/sdk.sh
+++ b/testing/sdk.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 while [[ "$(curl -s -o /dev/null -w ''%{http_code}'' guardian:6060/readyz)" != "200" ]]; do sleep 5; done
 while [[ "$(curl -s -o /dev/null -w ''%{http_code}'' spy:6060/metrics)" != "200" ]]; do sleep 5; done