diff --git a/npm_install.py b/npm_install.py
index 2684b9b..83de805 100644
--- a/npm_install.py
+++ b/npm_install.py
@@ -287,6 +287,39 @@ def validate_supported_os():
         print(f"✓ Supported OS detected: {OSREL.get('PRETTY', 'Unknown')}\n")
 
 
+def save_installer_config(config: dict):
+    config_path = Path("/data/installer.json")
+    config_path.parent.mkdir(parents=True, exist_ok=True)
+    
+    config["last_modified"] = time.strftime("%Y-%m-%d %H:%M:%S")
+    
+    try:
+        config_path.write_text(json.dumps(config, indent=2), encoding="utf-8")
+        if DEBUG:
+            print(f"✓ Saved installer config to {config_path}")
+    except Exception as e:
+        print(f"⚠ Warning: Could not save installer config: {e}")
+
+
+def load_installer_config() -> dict:
+    config_path = Path("/data/installer.json")
+    
+    if not config_path.exists():
+        if DEBUG:
+            print(f"No installer config found at {config_path}")
+        return {}
+    
+    try:
+        content = config_path.read_text(encoding="utf-8")
+        config = json.loads(content)
+        if DEBUG:
+            print(f"✓ Loaded installer config from {config_path}")
+        return config
+    except Exception as e:
+        print(f"⚠ Warning: Could not load installer config: {e}")
+        return {}
+
+
 def comment_x_served_by_step(path="/etc/angie/conf.d/include/proxy.conf"):
     p = Path(path)
     if not p.exists():
@@ -2042,6 +2075,19 @@ def update_only(
     if apply_dark:
         apply_dark_mode(**dark_env)
 
+
+    save_installer_config({
+        "ipv6_enabled": ipv6_enabled,
+        "dark_mode_enabled": apply_dark,
+        "tp_theme": dark_env.get("TP_THEME") if apply_dark else None,
+        "tp_domain": dark_env.get("TP_DOMAIN", TP_DOMAIN),
+        "tp_scheme": dark_env.get("TP_SCHEME", TP_SCHEME),
+        "tp_community_theme": dark_env.get("TP_COMMUNITY_THEME", TP_COMMUNITY_THEME),
+        "node_version": node_version,
+        "npm_version": version,
+    })
+
+
     with step("Restarting services after update"):
         run(["systemctl", "restart", "angie.service"], check=False)
         run(["systemctl", "restart", "npm.service"], check=False)
@@ -2209,6 +2255,18 @@ def main():
         selected_theme = None
 
     if args.update:
+        installer_config = load_installer_config()
+        
+        if not args.tp_theme and installer_config.get("tp_theme"):
+            selected_theme = installer_config["tp_theme"]
+            print(f"✓ Using stored theme: {selected_theme}")
+        
+        if not args.dark_mode and installer_config.get("dark_mode_enabled"):
+            args.dark_mode = True
+            print(f"✓ Using stored dark mode setting: enabled")
+        
+        stored_ipv6 = installer_config.get("ipv6_enabled", args.enable_ipv6)
+        
         install_logrotate_for_data_logs()
         fix_logrotate_permissions_and_wrapper()
         version = update_only(
@@ -2223,7 +2281,7 @@ def main():
                 TP_SCHEME=TP_SCHEME,
                 TP_THEME=args.tp_theme,
             ),
-            ipv6_enabled=args.enable_ipv6,
+            ipv6_enabled=stored_ipv6 if 'stored_ipv6' in locals() else args.enable_ipv6,
         )
         info = gather_versions(version)
         update_motd(args.motd == "yes", info, ipv6_enabled=args.enable_ipv6)
@@ -2280,6 +2338,18 @@ def main():
             TP_THEME=selected_theme,
         )
 
+    # Save installation configuration for future updates
+    save_installer_config({
+        "ipv6_enabled": args.enable_ipv6,
+        "dark_mode_enabled": dark_mode_enabled,
+        "tp_theme": selected_theme,
+        "tp_domain": TP_DOMAIN,
+        "tp_scheme": TP_SCHEME,
+        "tp_community_theme": TP_COMMUNITY_THEME,
+        "node_version": args.node_version,
+        "npm_version": npm_app_version,
+    })
+
     create_systemd_units(ipv6_enabled=args.enable_ipv6)
 
     ensure_nginx_symlink()