diff --git a/npm_install.py b/npm_install.py
index b2b30a5..5919bd4 100644
--- a/npm_install.py
+++ b/npm_install.py
@@ -6,6 +6,11 @@ from glob import glob
 
 DEBUG = False
 
+
+# ========== Configuration ==========
+# Maximum supported Node.js version (can be updated in the future)
+MAX_NODEJS_VERSION = 21 
+
 # ========== UI / Spinner ==========
 
 class Spinner:
@@ -170,6 +175,31 @@ def write_resolvers_conf(ipv6_enabled: bool):
     content = f"resolver {' '.join(ips)} valid=10s{ipv6_flag};\n"
     write_file(Path("/etc/angie/conf.d/include/resolvers.conf"), content, 0o644)
 
+def validate_nodejs_version(version: str) -> tuple[bool, str, str | None]:
+    version_map = {
+        'latest': '22',
+        'lts': '22',
+        'current': '23'
+    }
+    
+    resolved = version_map.get(version.lower(), version)
+    
+    match = re.match(r'(\d+)', resolved)
+    if not match:
+        return False, resolved, f"Invalid version format: {version}"
+    
+    major_version = int(match.group(1))
+    
+    if major_version > MAX_NODEJS_VERSION:
+        warning = (
+            f"⚠ WARNING: Requested Node.js v{major_version} exceeds maximum tested version (v{MAX_NODEJS_VERSION}).\n"
+            f"  NPM may not be compatible with Node.js v{major_version}.\n"
+            f"  Falling back to Node.js v{MAX_NODEJS_VERSION}.\n"
+            f"  To allow v{major_version}, update MAX_NODEJS_VERSION in the script."
+        )
+        return False, str(MAX_NODEJS_VERSION), warning
+    
+    return True, resolved, None
 
 def comment_x_served_by_step(path="/etc/angie/conf.d/include/proxy.conf"):
     p = Path(path)
@@ -861,17 +891,13 @@ def adjust_nginx_like_paths_in_tree(root: Path):
         txt = txt.replace("daemon on;", "#daemon on;")
         cand.write_text(txt, encoding="utf-8")
 
-def install_node_from_nodesource(version: str):
-
-    version_map = {
-        'latest': '22',
-        'lts': '22',
-        'current': '23'
-    }
+def install_node_from_nodesource(version: str):    
+    is_valid, resolved_version, warning = validate_nodejs_version(version)
     
-    node_version = version_map.get(version.lower(), version)
+    if warning:
+        print(warning)
     
-    match = re.match(r'(\d+)', node_version)
+    match = re.match(r'(\d+)', resolved_version)
     if not match:
         raise ValueError(f"Invalid Node.js version: {version}")
     
@@ -900,15 +926,14 @@ def install_node_from_nodesource(version: str):
         try:
             run(["curl", "-fsSL", setup_url, "-o", script_path])
             
-            # Make it executable
-            os.chmod(script_path, 0o755)
-            
+            os.chmod(script_path, 0o755)            
+
             if DEBUG:
                 subprocess.run(["bash", script_path], check=True)
             else:
                 run(["bash", script_path])
             
-            run(["apt-get", "update", "-y"])
+            run(["apt-get", "update", "-y"])            
             run(["apt-get", "install", "-y", "nodejs"])
             
         finally:
@@ -921,13 +946,15 @@ def install_node_from_nodesource(version: str):
         installed_major = re.match(r'v?(\d+)', node_ver)
         if installed_major and installed_major.group(1) != major_version:
             print(f"⚠ WARNING: Requested Node.js v{major_version}.x but got {node_ver}")
-            print(f"   This likely means NodeSource doesn't support your distribution yet.")
+            print(f"  This likely means NodeSource doesn't support your distribution yet.")
         
         if shutil.which("npm"):
             npm_ver = run_out(["npm", "--version"], check=False).strip()
-            print(f"✔ Node.js {node_ver} | npm {npm_ver}")
+            print(f"  Node.js: {node_ver}")
+            print(f"  npm: {npm_ver}")
         else:
-            print(f"✔ Install npm")
+            print(f"  Node.js: {node_ver}")
+            print(f"  ⚠ npm not found, attempting to install...")
             
             run(["apt-get", "install", "-y", "npm"], check=False)
             
@@ -936,9 +963,9 @@ def install_node_from_nodesource(version: str):
             
             if shutil.which("npm"):
                 npm_ver = run_out(["npm", "--version"], check=False).strip()
-                print(f"✔ npm {npm_ver} installed successfully")
+                print(f"  ✔ npm {npm_ver} installed successfully")
             else:
-                print(f"✖ npm could not be installed - manual intervention required")
+                print(f"  ✖ npm could not be installed - manual intervention required")
     else:
         print("✖ Node.js installation failed")
         raise RuntimeError("Node.js installation failed")
@@ -1554,7 +1581,9 @@ def main():
         formatter_class=argparse.ArgumentDefaultsHelpFormatter
     )
     parser.add_argument("--nodejs-pkg", default="nodejs", help="APT Node.js package name (e.g. nodejs, nodejs-18).")
-    parser.add_argument("--node-version", default=None, help="Install Node.js from NodeSource repo (e.g. 'latest', '22', '20', '18'). Overrides --nodejs-pkg.")
+    parser.add_argument("--node-version", default=None, 
+                    help=f"Install Node.js from NodeSource repo (e.g. 'latest', '21', '20', '18'). "
+                         f"Maximum supported: v{MAX_NODEJS_VERSION}. Overrides --nodejs-pkg.")
     parser.add_argument("--npm-version", default=None, help="Force NPM app version (e.g. 2.12.6). Default: latest release.")
     parser.add_argument("--motd", choices=["yes","no"], default="yes", help="Update MOTD after completion.")
     parser.add_argument("--enable-ipv6", action="store_true",