diff --git a/tools/check_for_upgrade.sh b/tools/check_for_upgrade.sh
old mode 100644
new mode 100755
index 581f03a07..1c63734ed
--- a/tools/check_for_upgrade.sh
+++ b/tools/check_for_upgrade.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 function _current_epoch() {
   echo $(($(date +%s) / 60 / 60 / 24))