diff --git a/script/prepare-commit-msg b/script/prepare-commit-msg
index 9c16c3f207..2c33549e77 100755
--- a/script/prepare-commit-msg
+++ b/script/prepare-commit-msg
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env zsh
 set -eo pipefail
 
 # exit on existing commit message