diff --git a/post-debootstrap-installer.sh b/post-debootstrap-installer.sh
index ac91e07..37db0ca 100755
--- a/post-debootstrap-installer.sh
+++ b/post-debootstrap-installer.sh
@@ -38,6 +38,7 @@ apt-get -y install linux-image-amd64
 
 # install grub
 apt-get -y install grub-efi-amd64
+update-grub
 grub-install
 
 # edit esp_uuid in fstab