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diff --git a/meshmc/updater/main.cpp b/meshmc/updater/main.cpp
new file mode 100644
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+++ b/meshmc/updater/main.cpp
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+/* SPDX-FileCopyrightText: 2026 Project Tick
+ * SPDX-FileContributor: Project Tick
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ *   MeshMC - A Custom Launcher for Minecraft
+ *   Copyright (C) 2026 Project Tick
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/*
+ * meshmc-updater — standalone updater binary for MeshMC.
+ *
+ * Usage:
+ *   meshmc-updater --url <download_url>
+ *                  --root <install_root>
+ *                  --exec <relaunch_path>
+ *
+ *   --url   : Full URL of the artifact to download and install.
+ *   --root  : Installation root directory (where meshmc binary lives).
+ *   --exec  : Path to the main MeshMC binary to relaunch after update.
+ *
+ * The binary waits a short time after launch to let the main application
+ * exit cleanly before overwriting its files.
+ */
+
+#include <QCoreApplication>
+#include <QCommandLineOption>
+#include <QCommandLineParser>
+#include <QDebug>
+#include <QThread>
+#include <QTimer>
+
+#include "Installer.h"
+
+int main(int argc, char* argv[])
+{
+	QCoreApplication app(argc, argv);
+	app.setApplicationName("meshmc-updater");
+	app.setOrganizationName("Project Tick");
+
+	QCommandLineParser parser;
+	parser.setApplicationDescription("MeshMC Updater");
+	parser.addHelpOption();
+
+	QCommandLineOption urlOpt("url", "URL of the update artifact to download.",
+							  "url");
+	QCommandLineOption rootOpt("root", "Installation root directory.", "root");
+	QCommandLineOption execOpt("exec", "Path to relaunch after update.",
+							   "exec");
+
+	parser.addOption(urlOpt);
+	parser.addOption(rootOpt);
+	parser.addOption(execOpt);
+	parser.process(app);
+
+	const QString url = parser.value(urlOpt).trimmed();
+	const QString root = parser.value(rootOpt).trimmed();
+	const QString exec = parser.value(execOpt).trimmed();
+
+	if (url.isEmpty() || root.isEmpty()) {
+		fprintf(stderr, "meshmc-updater: --url and --root are required.\n");
+		return 1;
+	}
+
+	qDebug() << "meshmc-updater: url =" << url << "| root =" << root
+			 << "| exec =" << exec;
+
+	// Give the main application 2 seconds to exit before we start overwriting
+	// files.
+	auto* installer = new Installer(&app);
+	installer->setDownloadUrl(url);
+	installer->setRootPath(root);
+	installer->setRelaunchPath(exec);
+
+	QObject::connect(installer, &Installer::progressMessage,
+					 [](const QString& msg) { qDebug() << "updater:" << msg; });
+
+	QObject::connect(
+		installer, &Installer::finished,
+		[](bool success, const QString& errorMsg) {
+			if (!success) {
+				qCritical()
+					<< "meshmc-updater: installation failed:" << errorMsg;
+				QCoreApplication::exit(1);
+			} else {
+				qDebug() << "meshmc-updater: update installed successfully.";
+				QCoreApplication::exit(0);
+			}
+		});
+
+	// Delay start to give the parent process time to close.
+	QTimer::singleShot(2000, &app, [installer]() { installer->start(); });
+
+	return app.exec();
+}