diff --git a/install-grub-security.sh b/install-grub-security.sh
index 040b841..080b31d 100755
--- a/install-grub-security.sh
+++ b/install-grub-security.sh
@@ -11,7 +11,7 @@ sudo 7za x -o/etc grub.d.my.7z -y;
 sudo chmod +x /etc/grub.d/*;
 sudo cp sbat /root/sbat -f;
 if [ ! -f /root/pubkey ]; then
-  sudo gpg --batch --passphrase '' --quick-gen-key root@localhost default default;
+  sudo gpg --batch --passphrase '' --quick-gen-key root@localhost rsa3072 default;
   sudo gpg --export -o /root/pubkey;
 fi
 sudo cp /root/pubkey /boot/pubkey -f;