diff --git a/src/commands/update.ts b/src/commands/update.ts
new file mode 100644
index 0000000..f09e255
--- /dev/null
+++ b/src/commands/update.ts
@@ -0,0 +1,109 @@
+import type { Command } from "commander";
+import { spawn } from "node:child_process";
+import { getCliVersion } from "~/lib/version.js";
+import { printError, printSuccess } from "~/lib/output.js";
+import { CliError } from "~/lib/errors.js";
+
+const PACKAGE_NAME = "bluebubbles-cli";
+const REGISTRY_URL = `https://registry.npmjs.org/${PACKAGE_NAME}/latest`;
+
+type LatestPackageInfo = {
+  version: string;
+  homepage?: string;
+};
+
+async function fetchLatestVersion(): Promise<LatestPackageInfo> {
+  const response = await fetch(REGISTRY_URL, { headers: { accept: "application/json" } });
+  if (!response.ok) {
+    throw new Error(`npm registry returned ${response.status} for ${REGISTRY_URL}`);
+  }
+  const body = (await response.json()) as LatestPackageInfo;
+  if (!body.version) {
+    throw new Error(`npm registry response missing 'version' for ${PACKAGE_NAME}`);
+  }
+  return body;
+}
+
+function compareSemver(a: string, b: string): number {
+  const parse = (s: string) => s.split(".").map((n) => Number.parseInt(n, 10) || 0);
+  const [aMaj, aMin, aPatch] = parse(a);
+  const [bMaj, bMin, bPatch] = parse(b);
+  if (aMaj !== bMaj) return (aMaj ?? 0) - (bMaj ?? 0);
+  if (aMin !== bMin) return (aMin ?? 0) - (bMin ?? 0);
+  return (aPatch ?? 0) - (bPatch ?? 0);
+}
+
+function runInstall(packageManager: "npm" | "bun" | "pnpm" | "yarn"): Promise<number> {
+  const command =
+    packageManager === "bun"
+      ? ["bun", "add", "-g", `${PACKAGE_NAME}@latest`]
+      : packageManager === "pnpm"
+        ? ["pnpm", "add", "-g", `${PACKAGE_NAME}@latest`]
+        : packageManager === "yarn"
+          ? ["yarn", "global", "add", `${PACKAGE_NAME}@latest`]
+          : ["npm", "install", "-g", `${PACKAGE_NAME}@latest`];
+  return new Promise((resolve) => {
+    const child = spawn(command[0]!, command.slice(1), { stdio: "inherit" });
+    child.on("exit", (code) => resolve(code ?? 0));
+    child.on("error", () => resolve(1));
+  });
+}
+
+export function registerUpdateCommands(program: Command): void {
+  program
+    .command("update")
+    .description(`Update ${PACKAGE_NAME} to the latest version on npm`)
+    .option("--check", "Only check for an available update; do not install")
+    .option(
+      "--package-manager <pm>",
+      "Package manager to use: npm | bun | pnpm | yarn (default: npm)",
+      "npm",
+    )
+    .action(async (options: { check?: boolean; packageManager?: string }) => {
+      const current = getCliVersion();
+      let latest: LatestPackageInfo;
+      try {
+        latest = await fetchLatestVersion();
+      } catch (error) {
+        printError(new CliError(error instanceof Error ? error.message : "Failed to query npm registry", "network"));
+        process.exitCode = 1;
+        return;
+      }
+
+      const cmp = compareSemver(current, latest.version);
+      if (cmp >= 0) {
+        printSuccess(
+          `${PACKAGE_NAME} is up to date (installed ${current}, latest ${latest.version}).`,
+          false,
+        );
+        return;
+      }
+
+      if (options.check) {
+        printSuccess(
+          `${PACKAGE_NAME} update available: ${current} → ${latest.version}. Run 'bluebubbles update' to install.`,
+          false,
+        );
+        return;
+      }
+
+      const pm = (options.packageManager ?? "npm").toLowerCase();
+      if (!["npm", "bun", "pnpm", "yarn"].includes(pm)) {
+        printError(new CliError(`Unknown --package-manager '${pm}'. Use npm | bun | pnpm | yarn.`, "validation"));
+        process.exitCode = 1;
+        return;
+      }
+
+      printSuccess(
+        `Updating ${PACKAGE_NAME} ${current} → ${latest.version} via ${pm}...`,
+        false,
+      );
+      const exitCode = await runInstall(pm as "npm" | "bun" | "pnpm" | "yarn");
+      if (exitCode !== 0) {
+        printError(new CliError(`Update failed (exit ${exitCode}). Try a different --package-manager.`, "general"));
+        process.exitCode = exitCode;
+        return;
+      }
+      printSuccess(`Updated ${PACKAGE_NAME} to ${latest.version}.`, false);
+    });
+}
diff --git a/src/index.ts b/src/index.ts
index b5abd8d..ee138d0 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -14,6 +14,7 @@ import { registerContactCommands } from "~/commands/contacts.js";
 import { registerPingCommands } from "~/commands/ping.js";
 import { registerDoctorCommands } from "~/commands/doctor.js";
 import { registerWebhookCommands } from "~/commands/webhooks.js";
+import { registerUpdateCommands } from "~/commands/update.js";
 import { getCliVersion } from "~/lib/version.js";
 
 function wantsJsonOutput(argv: string[]): boolean {
@@ -52,6 +53,7 @@ export function createProgram(): Command {
   registerContactCommands(program);
   registerICloudCommands(program);
   registerWebhookCommands(program);
+  registerUpdateCommands(program);
 
   return program;
 }