diff --git a/src/provision.py b/src/provision.py
index 8aa8726..d5eaecf 100644
--- a/src/provision.py
+++ b/src/provision.py
@@ -442,14 +442,14 @@ def step_add_ssh_key(iot_host: str):
         "set -e\n"
         "mkdir -p ~/.ssh\n"
         "chmod 700 ~/.ssh\n"
-        "echo " + shlex.quote(ssh_key) + " >> ~/.ssh/authorized_keys\n"
+        "touch ~/.ssh/authorized_keys\n"
         "chmod 600 ~/.ssh/authorized_keys\n"
+        "grep -qF " + shlex.quote(ssh_key) + " ~/.ssh/authorized_keys "
+        "|| echo " + shlex.quote(ssh_key) + " >> ~/.ssh/authorized_keys\n"
         "echo 'SSH key for paul added successfully'\n"
     )
-    
-    ssh_cmd = ["ssh", "-p", str(SSH_PORT)]
-    if SSH_KEY:
-        ssh_cmd += ["-i", SSH_KEY]
+
+    ssh_cmd = ["ssh", "-p", str(SSH_PORT)] + _ssh_base_opts()
     ssh_cmd += [f"{SSH_USER}@{iot_host}", remote]
     
     proc = subprocess.run(ssh_cmd, check=False, capture_output=True, text=True)
@@ -509,7 +509,7 @@ def main():
     ap.add_argument(
         "--steps",
         nargs="+",
-        choices=["pull", "wg", "hostname", "mac", "add_ssh_key", "update_app", "start_app", "finish", "all"],
+        choices=["pull", "wg", "hostname", "mac", "add_ssh_key", "system_update", "update_app", "start_app", "finish", "all"],
         default=["all"],
         help="Which steps to run. Default: all",
     )