diff --git a/maix/version.py b/maix/version.py
index 00d7a126..8a223e23 100644
--- a/maix/version.py
+++ b/maix/version.py
@@ -3,6 +3,6 @@
 
 version_major = 4
 version_minor = 9
-version_patch = 0
+version_patch = 1
 
 __version__ = "{}.{}.{}".format(version_major, version_minor, version_patch)
diff --git a/tools/os/update_img.sh b/tools/os/update_img.sh
index 26bd2dc6..42c26921 100755
--- a/tools/os/update_img.sh
+++ b/tools/os/update_img.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -e
 set -o pipefail