diff --git a/util/prepare.sh b/util/prepare.sh
index 6a066848..46859354 100755
--- a/util/prepare.sh
+++ b/util/prepare.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 source .env
 envsubst < chains/chains_mainnet.json > chains/chains_mainnet.json