diff --git a/00_setup.md b/00_setup.md
index e4b58a8..8641a01 100644
--- a/00_setup.md
+++ b/00_setup.md
@@ -113,9 +113,8 @@ Go back to `root` account now, otherwise you will need to `sudo` the commands be
 The following commands will lock out the root by configuring `/etc/ssh/sshd_config` file.
 
 ```sh
-sed -i 's/PermitRootLogin.*/PermitRootLogin no/' /etc/ssh/sshd_config &&
-sed -i 's/#PermitRootLogin.*/PermitRootLogin no/' /etc/ssh/sshd_config &&
-sed -i 's/PasswordAuthentication.*/PasswordAuthentication no/' /etc/ssh/sshd_config &&
+sed -i '/^PermitRootLogin/c\PermitRootLogin no' /etc/ssh/sshd_config
+sed -i '/^PasswordAuthentication/c\PasswordAuthentication no' /etc/ssh/sshd_config
 systemctl restart sshd
 ````