diff --git a/packages/upgrade/README.md b/packages/upgrade/README.md
new file mode 100644
index 000000000..0f9db27a7
--- /dev/null
+++ b/packages/upgrade/README.md
@@ -0,0 +1,21 @@
+# @astrojs/upgrade
+
+## Upgrade utility for Astro projects
+
+**With NPM:**
+
+```bash
+npm exec @astrojs/upgrade
+```
+
+**With Yarn:**
+
+```bash
+yarn exec @astrojs/upgrade
+```
+
+**With PNPM:**
+
+```bash
+pnpm exec @astrojs/upgrade
+```
diff --git a/packages/upgrade/package.json b/packages/upgrade/package.json
new file mode 100644
index 000000000..3b4388eec
--- /dev/null
+++ b/packages/upgrade/package.json
@@ -0,0 +1,48 @@
+{
+  "name": "@astrojs/upgrade",
+  "version": "0.0.1",
+  "type": "module",
+  "author": "withastro",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/withastro/astro.git",
+    "directory": "packages/upgrade"
+  },
+  "bugs": "https://github.com/withastro/astro/issues",
+  "homepage": "https://astro.build",
+  "exports": {
+    ".": "./upgrade.mjs"
+  },
+  "main": "./upgrade.mjs",
+  "bin": {
+    "@astrojs/upgrade": "./upgrade.mjs"
+  },
+  "scripts": {
+    "build": "astro-scripts build \"src/index.ts\" --bundle && tsc",
+    "build:ci": "astro-scripts build \"src/index.ts\" --bundle",
+    "dev": "astro-scripts dev \"src/**/*.ts\"",
+    "test": "mocha --exit --timeout 20000 --parallel"
+  },
+  "files": [
+    "dist",
+    "upgrade.js"
+  ],
+  "//a": "MOST PACKAGES SHOULD GO IN DEV_DEPENDENCIES! THEY WILL BE BUNDLED.",
+  "//b": "DEPENDENCIES IS FOR UNBUNDLED PACKAGES",
+  "dependencies": {
+    "@astrojs/cli-kit": "^0.2.3",
+    "node-fetch-native": "^1.4.0",
+    "which-pm-runs": "^1.1.0"
+  },
+  "devDependencies": {
+    "@types/which-pm-runs": "^1.0.0",
+    "arg": "^5.0.2",
+    "astro-scripts": "workspace:*",
+    "chai": "^4.3.7",
+    "mocha": "^10.2.0"
+  },
+  "engines": {
+    "node": ">=18.14.1"
+  }
+}
diff --git a/packages/upgrade/src/actions/context.ts b/packages/upgrade/src/actions/context.ts
new file mode 100644
index 000000000..d58986f7d
--- /dev/null
+++ b/packages/upgrade/src/actions/context.ts
@@ -0,0 +1,52 @@
+import { prompt } from '@astrojs/cli-kit';
+import arg from 'arg';
+import { pathToFileURL } from 'node:url';
+import detectPackageManager from 'which-pm-runs';
+
+export interface Context {
+	help: boolean;
+	prompt: typeof prompt;
+	version: string;
+	dryRun?: boolean;
+	cwd: URL;
+	stdin?: typeof process.stdin;
+	stdout?: typeof process.stdout;
+	packageManager: string;
+	packages: PackageInfo[];
+	exit(code: number): never;
+}
+
+export interface PackageInfo {
+	name: string;
+	currentVersion: string;
+	targetVersion: string;
+	isDevDependency?: boolean;
+}
+
+export async function getContext(argv: string[]): Promise<Context> {
+	const flags = arg(
+		{
+			'--dry-run': Boolean,
+			'--help': Boolean,
+
+			'-h': '--help',
+		},
+		{ argv, permissive: true }
+	)
+
+	const packageManager = detectPackageManager()?.name ?? 'npm';
+	const { _: [version = 'latest'] = [], '--help': help = false, '--dry-run': dryRun } = flags;
+
+	return {
+		help,
+		prompt,
+		packageManager,
+		packages: [],
+		cwd: pathToFileURL(process.cwd()),
+		dryRun,
+		version,
+		exit(code) {
+			process.exit(code);
+		},
+	} satisfies Context
+}
diff --git a/packages/upgrade/src/actions/help.ts b/packages/upgrade/src/actions/help.ts
new file mode 100644
index 000000000..d61abc71e
--- /dev/null
+++ b/packages/upgrade/src/actions/help.ts
@@ -0,0 +1,15 @@
+import { printHelp } from '../messages.js';
+
+export function help() {
+	printHelp({
+		commandName: '@astrojs/upgrade',
+		usage: '[version] [...flags]',
+		headline: 'Upgrade Astro dependencies.',
+		tables: {
+			Flags: [
+				['--help (-h)', 'See all available flags.'],
+				['--dry-run', 'Walk through steps without executing.']
+			],
+		},
+	});
+}
diff --git a/packages/upgrade/src/actions/install.ts b/packages/upgrade/src/actions/install.ts
new file mode 100644
index 000000000..6e14a2663
--- /dev/null
+++ b/packages/upgrade/src/actions/install.ts
@@ -0,0 +1,57 @@
+import type { Context } from './context.js';
+
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { color } from '@astrojs/cli-kit';
+import { error, info, spinner } from '../messages.js';
+import { shell } from '../shell.js';
+
+export async function install(
+	ctx: Pick<Context, 'version' | 'packages' | 'packageManager' | 'dryRun' | 'cwd'>
+) {
+	if (ctx.dryRun) {
+		await info('--dry-run', `Skipping dependency installation`);
+	} else {
+		await spinner({
+			start: `Updating dependencies with ${ctx.packageManager}...`,
+			end: 'Dependencies updated',
+			while: () => {
+				return runCommand(ctx).catch((e) => {
+					error('error', e);
+					error(
+						'error',
+						`Dependencies failed to install, please run ${color.bold(
+							ctx.packageManager + ' install'
+						)}  to install them manually after setup.`
+					);
+				});
+			},
+		});
+	}
+}
+
+async function runCommand(ctx: Pick<Context, 'packageManager' | 'packages' | 'cwd'>) {
+	const cwd = fileURLToPath(ctx.cwd);
+	if (ctx.packageManager === 'yarn') await ensureYarnLock({ cwd });
+
+	const dependencies: string[] = [];
+	const devDependencies: string[] = [];
+	for (const { name, targetVersion, isDevDependency } of ctx.packages) {
+		const arr = isDevDependency ? devDependencies : dependencies;
+		arr.push(`${name}@${targetVersion}`);
+	}
+
+	if (dependencies.length > 0) {
+		await shell(ctx.packageManager, ['install', ...dependencies], { cwd, timeout: 90_000, stdio: 'ignore' });
+	}
+	if (devDependencies.length > 0) {
+		await shell(ctx.packageManager, ['install', '--save-dev', ...devDependencies], { cwd, timeout: 90_000, stdio: 'ignore' });
+	}
+}
+
+async function ensureYarnLock({ cwd }: { cwd: string }) {
+	const yarnLock = path.join(cwd, 'yarn.lock');
+	if (fs.existsSync(yarnLock)) return;
+	return fs.promises.writeFile(yarnLock, '', { encoding: 'utf-8' });
+}
diff --git a/packages/upgrade/src/actions/verify.ts b/packages/upgrade/src/actions/verify.ts
new file mode 100644
index 000000000..2f7d65443
--- /dev/null
+++ b/packages/upgrade/src/actions/verify.ts
@@ -0,0 +1,109 @@
+import type { Context, PackageInfo } from './context';
+
+import dns from 'node:dns/promises';
+import { existsSync } from 'node:fs';
+import { readFile } from 'node:fs/promises';
+import { color } from '@astrojs/cli-kit';
+import { bannerAbort, error, getRegistry, info, log } from '../messages.js';
+
+
+export async function verify(
+	ctx: Pick<Context, 'version' | 'packages' | 'cwd' | 'dryRun' | 'exit'>
+) {
+	const registry = await getRegistry();
+
+	if (!ctx.dryRun) {
+		const online = await isOnline(registry);
+		if (!online) {
+			bannerAbort();
+			log('');
+			error('error', `Unable to connect to the internet.`);
+			ctx.exit(1);
+		}
+	}
+
+	await verifyAstroProject(ctx);
+
+	const ok = await verifyVersions(ctx, registry);
+	if (!ok) {
+		bannerAbort();
+		log('');
+		error('error', `Version ${color.reset(ctx.version)} ${color.dim('could not be found!')}`);
+		await info('check', 'https://github.com/withastro/astro/releases');
+		ctx.exit(1);
+	}
+}
+
+function isOnline(registry: string): Promise<boolean> {
+	const { host } = new URL(registry);
+	return dns.lookup(host).then(
+		() => true,
+		() => false
+	);
+}
+
+function safeJSONParse(value: string) {
+	try {
+		return JSON.parse(value);
+	} catch {}
+	return {}
+}
+
+async function verifyAstroProject(ctx: Pick<Context, 'cwd' | 'version' | 'packages'>) {
+	const packageJson = new URL('./package.json', ctx.cwd);
+    if (!existsSync(packageJson)) return false;
+	const contents = await readFile(packageJson, { encoding: 'utf-8' });
+	if (!contents.includes('astro')) return false;
+
+	const { dependencies = {}, devDependencies = {} } = safeJSONParse(contents)
+	if (dependencies['astro'] === undefined && devDependencies['astro'] === undefined) return false;
+	
+	// Side-effect! Persist dependency info to the shared context
+	collectPackageInfo(ctx, dependencies, devDependencies);
+	
+	return true;
+}
+
+function isAstroPackage(name: string) {
+	return name === 'astro' || name.startsWith('@astrojs/');
+}
+
+function collectPackageInfo(ctx: Pick<Context, 'version' | 'packages'>, dependencies: Record<string, string>, devDependencies: Record<string, string>) {
+	for (const [name, currentVersion] of Object.entries(dependencies)) {
+		if (!isAstroPackage(name)) continue;
+		ctx.packages.push({
+			name,
+			currentVersion,
+			targetVersion: ctx.version,
+		})
+	}
+	for (const [name, currentVersion] of Object.entries(devDependencies)) {
+		if (!isAstroPackage(name)) continue;
+		ctx.packages.push({
+			name,
+			currentVersion,
+			targetVersion: ctx.version,
+			isDevDependency: true
+		})
+	}
+}
+
+async function verifyVersions(ctx: Pick<Context, 'version' | 'packages'>, registry: string) {
+	const tasks: Promise<void>[] = [];
+	for (const packageInfo of ctx.packages) {
+		tasks.push(resolveTargetVersion(packageInfo, registry));
+	}
+	await Promise.all(tasks);
+	for (const packageInfo of ctx.packages) {
+		// check for packageInfo.targetVersion, then fallback
+		// check if packageInfo.targetVersion === packageInfo.currentVersion
+	}
+	return true;
+}
+
+async function resolveTargetVersion(packageInfo: PackageInfo, registry: string): Promise<void> {
+	const res = await fetch(`${registry}/${packageInfo.name}/tags/${packageInfo.targetVersion}`);
+	
+	// MUTATE packageInfo.targetVersion to resolvedValue
+}
+
diff --git a/packages/upgrade/src/index.ts b/packages/upgrade/src/index.ts
new file mode 100644
index 000000000..ab216ad56
--- /dev/null
+++ b/packages/upgrade/src/index.ts
@@ -0,0 +1,40 @@
+import { getContext } from './actions/context.js';
+
+import { install } from './actions/install.js';
+import { help } from './actions/help.js';
+import { verify } from './actions/verify.js';
+import { setStdout } from './messages.js';
+
+const exit = () => process.exit(0);
+process.on('SIGINT', exit);
+process.on('SIGTERM', exit);
+
+export async function main() {
+	// NOTE: In the v7.x version of npm, the default behavior of `npm init` was changed
+	// to no longer require `--` to pass args and instead pass `--` directly to us. This
+	// broke our arg parser, since `--` is a special kind of flag. Filtering for `--` here
+	// fixes the issue so that create-astro now works on all npm versions.
+	const cleanArgv = process.argv.slice(2).filter((arg) => arg !== '--');
+	const ctx = await getContext(cleanArgv);
+	if (ctx.help) {
+		help();
+		return;
+	}
+
+	const steps = [
+		verify,
+		install,
+	];
+
+	for (const step of steps) {
+		await step(ctx);
+	}
+	process.exit(0);
+}
+
+export {
+	install,
+	getContext,
+	setStdout,
+	verify,
+};
diff --git a/packages/upgrade/src/messages.ts b/packages/upgrade/src/messages.ts
new file mode 100644
index 000000000..1dc0711de
--- /dev/null
+++ b/packages/upgrade/src/messages.ts
@@ -0,0 +1,221 @@
+/* eslint no-console: 'off' */
+import { color, say as houston, label, spinner as load } from '@astrojs/cli-kit';
+import { align, sleep } from '@astrojs/cli-kit/utils';
+import fetch from 'node-fetch-native';
+import { exec } from 'node:child_process';
+import stripAnsi from 'strip-ansi';
+import detectPackageManager from 'which-pm-runs';
+import { shell } from './shell.js';
+
+// Users might lack access to the global npm registry, this function
+// checks the user's project type and will return the proper npm registry
+//
+// A copy of this function also exists in the astro package
+export async function getRegistry(): Promise<string> {
+	const packageManager = detectPackageManager()?.name || 'npm';
+	try {
+		const { stdout } = await shell(packageManager, ['config', 'get', 'registry']);
+		return stdout?.trim()?.replace(/\/$/, '') || 'https://registry.npmjs.org';
+	} catch (e) {
+		return 'https://registry.npmjs.org';
+	}
+}
+
+let stdout = process.stdout;
+/** @internal Used to mock `process.stdout.write` for testing purposes */
+export function setStdout(writable: typeof process.stdout) {
+	stdout = writable;
+}
+
+export async function say(messages: string | string[], { clear = false, hat = '' } = {}) {
+	return houston(messages, { clear, hat, stdout });
+}
+
+export async function spinner(args: {
+	start: string;
+	end: string;
+	while: (...args: any) => Promise<any>;
+}) {
+	await load(args, { stdout });
+}
+
+export const title = (text: string) => align(label(text), 'end', 7) + ' ';
+
+export const welcome = [
+	`Let's claim your corner of the internet.`,
+	`I'll be your assistant today.`,
+	`Let's build something awesome!`,
+	`Let's build something great!`,
+	`Let's build something fast!`,
+	`Let's build the web we want.`,
+	`Let's make the web weird!`,
+	`Let's make the web a better place!`,
+	`Let's create a new project!`,
+	`Let's create something unique!`,
+	`Time to build a new website.`,
+	`Time to build a faster website.`,
+	`Time to build a sweet new website.`,
+	`We're glad to have you on board.`,
+	`Keeping the internet weird since 2021.`,
+	`Initiating launch sequence...`,
+	`Initiating launch sequence... right... now!`,
+	`Awaiting further instructions.`,
+];
+
+export const getName = () =>
+	new Promise<string>((resolve) => {
+		exec('git config user.name', { encoding: 'utf-8' }, (_1, gitName) => {
+			if (gitName.trim()) {
+				return resolve(gitName.split(' ')[0].trim());
+			}
+			exec('whoami', { encoding: 'utf-8' }, (_3, whoami) => {
+				if (whoami.trim()) {
+					return resolve(whoami.split(' ')[0].trim());
+				}
+				return resolve('astronaut');
+			});
+		});
+	});
+
+let v: string;
+export const getVersion = () =>
+	new Promise<string>(async (resolve) => {
+		if (v) return resolve(v);
+		let registry = await getRegistry();
+		const { version } = await fetch(`${registry}/astro/latest`, { redirect: 'follow' }).then(
+			(res) => res.json(),
+			() => ({ version: '' })
+		);
+		v = version;
+		resolve(version);
+	});
+
+export const log = (message: string) => stdout.write(message + '\n');
+export const banner = async (version: string) =>
+	log(
+		`\n${label('astro', color.bgGreen, color.black)}${
+			version ? '  ' + color.green(color.bold(`v${version}`)) : ''
+		} ${color.bold('Launch sequence initiated.')}`
+	);
+
+export const bannerAbort = () =>
+	log(`\n${label('astro', color.bgRed)} ${color.bold('Launch sequence aborted.')}`);
+
+export const info = async (prefix: string, text: string) => {
+	await sleep(100);
+	if (stdout.columns < 80) {
+		log(`${' '.repeat(5)} ${color.cyan('◼')}  ${color.cyan(prefix)}`);
+		log(`${' '.repeat(9)}${color.dim(text)}`);
+	} else {
+		log(`${' '.repeat(5)} ${color.cyan('◼')}  ${color.cyan(prefix)} ${color.dim(text)}`);
+	}
+};
+export const error = async (prefix: string, text: string) => {
+	if (stdout.columns < 80) {
+		log(`${' '.repeat(5)} ${color.red('▲')}  ${color.red(prefix)}`);
+		log(`${' '.repeat(9)}${color.dim(text)}`);
+	} else {
+		log(`${' '.repeat(5)} ${color.red('▲')}  ${color.red(prefix)} ${color.dim(text)}`);
+	}
+};
+
+export const typescriptByDefault = async () => {
+	await info(`No worries!`, 'TypeScript is supported in Astro by default,');
+	log(`${' '.repeat(9)}${color.dim('but you are free to continue writing JavaScript instead.')}`);
+	await sleep(1000);
+};
+
+export const nextSteps = async ({ projectDir, devCmd }: { projectDir: string; devCmd: string }) => {
+	const max = stdout.columns;
+	const prefix = max < 80 ? ' ' : ' '.repeat(9);
+	await sleep(200);
+	log(
+		`\n ${color.bgCyan(` ${color.black('next')} `)}  ${color.bold(
+			'Liftoff confirmed. Explore your project!'
+		)}`
+	);
+
+	await sleep(100);
+	if (projectDir !== '') {
+		projectDir = projectDir.includes(' ') ? `"./${projectDir}"` : `./${projectDir}`;
+		const enter = [
+			`\n${prefix}Enter your project directory using`,
+			color.cyan(`cd ${projectDir}`, ''),
+		];
+		const len = enter[0].length + stripAnsi(enter[1]).length;
+		log(enter.join(len > max ? '\n' + prefix : ' '));
+	}
+	log(
+		`${prefix}Run ${color.cyan(devCmd)} to start the dev server. ${color.cyan('CTRL+C')} to stop.`
+	);
+	await sleep(100);
+	log(
+		`${prefix}Add frameworks like ${color.cyan(`react`)} or ${color.cyan(
+			'tailwind'
+		)} using ${color.cyan('astro add')}.`
+	);
+	await sleep(100);
+	log(`\n${prefix}Stuck? Join us at ${color.cyan(`https://astro.build/chat`)}`);
+	await sleep(200);
+};
+
+export function printHelp({
+	commandName,
+	headline,
+	usage,
+	tables,
+	description,
+}: {
+	commandName: string;
+	headline?: string;
+	usage?: string;
+	tables?: Record<string, [command: string, help: string][]>;
+	description?: string;
+}) {
+	const linebreak = () => '';
+	const table = (rows: [string, string][], { padding }: { padding: number }) => {
+		const split = stdout.columns < 60;
+		let raw = '';
+
+		for (const row of rows) {
+			if (split) {
+				raw += `    ${row[0]}\n    `;
+			} else {
+				raw += `${`${row[0]}`.padStart(padding)}`;
+			}
+			raw += '  ' + color.dim(row[1]) + '\n';
+		}
+
+		return raw.slice(0, -1); // remove latest \n
+	};
+
+	let message = [];
+
+	if (headline) {
+		message.push(
+			linebreak(),
+			`${title(commandName)} ${color.green(`v${process.env.PACKAGE_VERSION ?? ''}`)} ${headline}`
+		);
+	}
+
+	if (usage) {
+		message.push(linebreak(), `${color.green(commandName)} ${color.bold(usage)}`);
+	}
+
+	if (tables) {
+		function calculateTablePadding(rows: [string, string][]) {
+			return rows.reduce((val, [first]) => Math.max(val, first.length), 0);
+		}
+		const tableEntries = Object.entries(tables);
+		const padding = Math.max(...tableEntries.map(([, rows]) => calculateTablePadding(rows)));
+		for (const [, tableRows] of tableEntries) {
+			message.push(linebreak(), table(tableRows, { padding }));
+		}
+	}
+
+	if (description) {
+		message.push(linebreak(), `${description}`);
+	}
+
+	log(message.join('\n') + '\n');
+}
diff --git a/packages/upgrade/src/shell.ts b/packages/upgrade/src/shell.ts
new file mode 100644
index 000000000..e6f1295ea
--- /dev/null
+++ b/packages/upgrade/src/shell.ts
@@ -0,0 +1,51 @@
+// This is an extremely simplified version of [`execa`](https://github.com/sindresorhus/execa)
+// intended to keep our dependency size down
+import type { ChildProcess, StdioOptions } from 'node:child_process';
+import type { Readable } from 'node:stream';
+
+import { spawn } from 'node:child_process';
+import { text as textFromStream } from 'node:stream/consumers';
+
+export interface ExecaOptions {
+	cwd?: string | URL;
+	stdio?: StdioOptions;
+	timeout?: number;
+}
+export interface Output {
+	stdout: string;
+	stderr: string;
+	exitCode: number;
+}
+const text = (stream: NodeJS.ReadableStream | Readable | null) =>
+	stream ? textFromStream(stream).then((t) => t.trimEnd()) : '';
+
+export async function shell(
+	command: string,
+	flags: string[],
+	opts: ExecaOptions = {}
+): Promise<Output> {
+	let child: ChildProcess;
+	let stdout = '';
+	let stderr = '';
+	try {
+		child = spawn(command, flags, {
+			cwd: opts.cwd,
+			shell: true,
+			stdio: opts.stdio,
+			timeout: opts.timeout,
+		});
+		const done = new Promise((resolve) => child.on('close', resolve));
+		[stdout, stderr] = await Promise.all([text(child.stdout), text(child.stderr)]);
+		await done;
+	} catch (e) {
+		throw { stdout, stderr, exitCode: 1 };
+	}
+	const { exitCode } = child;
+	if (exitCode === null) {
+		throw new Error('Timeout');
+	}
+	if (exitCode !== 0) {
+		throw new Error(stderr);
+	}
+	return { stdout, stderr, exitCode };
+}
diff --git a/packages/upgrade/test/fixtures/empty/.gitkeep b/packages/upgrade/test/fixtures/empty/.gitkeep
new file mode 100644
index 000000000..e69de29bb
diff --git a/packages/upgrade/test/fixtures/not-empty/git.json b/packages/upgrade/test/fixtures/not-empty/git.json
new file mode 100644
index 000000000..9e26dfeeb
--- /dev/null
+++ b/packages/upgrade/test/fixtures/not-empty/git.json
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/packages/upgrade/test/fixtures/not-empty/package.json b/packages/upgrade/test/fixtures/not-empty/package.json
new file mode 100644
index 000000000..5edb64fea
--- /dev/null
+++ b/packages/upgrade/test/fixtures/not-empty/package.json
@@ -0,0 +1,4 @@
+{
+  "name": "@test/create-astro-not-empty",
+  "private": true
+}
diff --git a/packages/upgrade/test/fixtures/not-empty/tsconfig.json b/packages/upgrade/test/fixtures/not-empty/tsconfig.json
new file mode 100644
index 000000000..9e26dfeeb
--- /dev/null
+++ b/packages/upgrade/test/fixtures/not-empty/tsconfig.json
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/packages/upgrade/test/install.test.js b/packages/upgrade/test/install.test.js
new file mode 100644
index 000000000..ca1224aa0
--- /dev/null
+++ b/packages/upgrade/test/install.test.js
@@ -0,0 +1,72 @@
+import { expect } from 'chai';
+
+import { install } from '../dist/index.js';
+import { setup } from './utils.js';
+
+describe('install', () => {
+	const fixture = setup();
+
+	it('--yes', async () => {
+		const context = {
+			cwd: '',
+			yes: true,
+			pkgManager: 'npm',
+			dryRun: true,
+			prompt: () => ({ deps: true }),
+		};
+		await install(context);
+		expect(fixture.hasMessage('Skipping dependency installation')).to.be.true;
+	});
+
+	it('prompt yes', async () => {
+		const context = {
+			cwd: '',
+			pkgManager: 'npm',
+			dryRun: true,
+			prompt: () => ({ deps: true }),
+			install: undefined,
+		};
+		await install(context);
+		expect(fixture.hasMessage('Skipping dependency installation')).to.be.true;
+		expect(context.install).to.eq(true);
+	});
+
+	it('prompt no', async () => {
+		const context = {
+			cwd: '',
+			pkgManager: 'npm',
+			dryRun: true,
+			prompt: () => ({ deps: false }),
+			install: undefined,
+		};
+		await install(context);
+		expect(fixture.hasMessage('Skipping dependency installation')).to.be.true;
+		expect(context.install).to.eq(false);
+	});
+
+	it('--install', async () => {
+		const context = {
+			cwd: '',
+			install: true,
+			pkgManager: 'npm',
+			dryRun: true,
+			prompt: () => ({ deps: false }),
+		};
+		await install(context);
+		expect(fixture.hasMessage('Skipping dependency installation')).to.be.true;
+		expect(context.install).to.eq(true);
+	});
+
+	it('--no-install', async () => {
+		const context = {
+			cwd: '',
+			install: false,
+			pkgManager: 'npm',
+			dryRun: true,
+			prompt: () => ({ deps: false }),
+		};
+		await install(context);
+		expect(fixture.hasMessage('Skipping dependency installation')).to.be.true;
+		expect(context.install).to.eq(false);
+	});
+});
diff --git a/packages/upgrade/test/utils.js b/packages/upgrade/test/utils.js
new file mode 100644
index 000000000..ff5d5dd83
--- /dev/null
+++ b/packages/upgrade/test/utils.js
@@ -0,0 +1,31 @@
+import { setStdout } from '../dist/index.js';
+import stripAnsi from 'strip-ansi';
+
+export function setup() {
+	const ctx = { messages: [] };
+	before(() => {
+		setStdout(
+			Object.assign({}, process.stdout, {
+				write(buf) {
+					ctx.messages.push(stripAnsi(String(buf)).trim());
+					return true;
+				},
+			})
+		);
+	});
+	beforeEach(() => {
+		ctx.messages = [];
+	});
+
+	return {
+		messages() {
+			return ctx.messages;
+		},
+		length() {
+			return ctx.messages.length;
+		},
+		hasMessage(content) {
+			return !!ctx.messages.find((msg) => msg.includes(content));
+		},
+	};
+}
diff --git a/packages/upgrade/test/verify.test.js b/packages/upgrade/test/verify.test.js
new file mode 100644
index 000000000..ecfaba727
--- /dev/null
+++ b/packages/upgrade/test/verify.test.js
@@ -0,0 +1,41 @@
+import { expect } from 'chai';
+
+import { verify } from '../dist/index.js';
+import { setup } from './utils.js';
+
+describe('verify', () => {
+	const fixture = setup();
+	const exit = (code) => {
+		throw code;
+	};
+
+	it('basics', async () => {
+		const context = { template: 'basics', exit };
+		await verify(context);
+		expect(fixture.messages().length).to.equal(0, 'Did not expect `verify` to log any messages');
+	});
+
+	it('missing', async () => {
+		const context = { template: 'missing', exit };
+		let err = null;
+		try {
+			await verify(context);
+		} catch (e) {
+			err = e;
+		}
+		expect(err).to.eq(1);
+		expect(fixture.hasMessage('Template missing does not exist!'));
+	});
+
+	it('starlight', async () => {
+		const context = { template: 'starlight', exit };
+		await verify(context);
+		expect(fixture.messages().length).to.equal(0, 'Did not expect `verify` to log any messages');
+	});
+
+	it('starlight/tailwind', async () => {
+		const context = { template: 'starlight/tailwind', exit };
+		await verify(context);
+		expect(fixture.messages().length).to.equal(0, 'Did not expect `verify` to log any messages');
+	});
+});
diff --git a/packages/upgrade/tsconfig.json b/packages/upgrade/tsconfig.json
new file mode 100644
index 000000000..1ab34c5a2
--- /dev/null
+++ b/packages/upgrade/tsconfig.json
@@ -0,0 +1,13 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "include": ["src", "index.d.ts"],
+  "compilerOptions": {
+    "allowJs": true,
+    "emitDeclarationOnly": false,
+    "noEmit": true,
+    "target": "ES2022",
+    "module": "ES2022",
+    "outDir": "./dist",
+    "declarationDir": "./dist/types"
+  }
+}
diff --git a/packages/upgrade/upgrade.mjs b/packages/upgrade/upgrade.mjs
new file mode 100755
index 000000000..f9df779d8
--- /dev/null
+++ b/packages/upgrade/upgrade.mjs
@@ -0,0 +1,15 @@
+#!/usr/bin/env node
+/* eslint-disable no-console */
+'use strict';
+
+const currentVersion = process.versions.node;
+const requiredMajorVersion = parseInt(currentVersion.split('.')[0], 10);
+const minimumMajorVersion = 18;
+
+if (requiredMajorVersion < minimumMajorVersion) {
+	console.error(`Node.js v${currentVersion} is out of date and unsupported!`);
+	console.error(`Please use Node.js v${minimumMajorVersion} or higher.`);
+	process.exit(1);
+}
+
+import('./dist/index.js').then(({ main }) => main());