diff --git a/src/config/app.ts b/src/config/app.ts
index 937e4e2..b382354 100644
--- a/src/config/app.ts
+++ b/src/config/app.ts
@@ -31,6 +31,17 @@ export const appConfig: AppConfig = {
 
 	// Log stuff
 	log: true,
+
+	// Enable update
+	allowUpdate: true,
+
+	// Required parameter to include in `/update` query to trigger update
+	// Value must match environment variable `APP_UPDATE_SECRET`
+	updateRequiredParam: 'secret',
+
+	// Update check throttling
+	// Delay to wait between successful update request and actual update
+	updateThrottle: 60,
 };
 
 /**
diff --git a/src/data/icon-sets.ts b/src/data/icon-sets.ts
index c81e0d0..68c0d80 100644
--- a/src/data/icon-sets.ts
+++ b/src/data/icon-sets.ts
@@ -84,3 +84,26 @@ export function updateIconSets(): number {
 	prefixes = Array.from(newPrefixes);
 	return prefixes.length;
 }
+
+/**
+ * Trigger update
+ */
+export function triggerIconSetsUpdate() {
+	if (!importers) {
+		return;
+	}
+	console.log('Checking for updates...');
+
+	(async () => {
+		let updated = false;
+		for (let i = 0; i < importers?.length; i++) {
+			updated = (await importers[i].checkForUpdate()) || updated;
+		}
+		return updated;
+	})()
+		.then((updated) => {
+			console.log(updated ? 'Update complete' : 'Nothing to update');
+			updateIconSets();
+		})
+		.catch(console.error);
+}
diff --git a/src/http/index.ts b/src/http/index.ts
index 981bec0..93a1231 100644
--- a/src/http/index.ts
+++ b/src/http/index.ts
@@ -5,6 +5,7 @@ import { iconNameRoutePartialRegEx, iconNameRouteRegEx, splitIconName } from '..
 import { generateIconsDataResponse } from './responses/icons';
 import { generateLastModifiedResponse } from './responses/modified';
 import { generateSVGResponse } from './responses/svg';
+import { generateUpdateResponse } from './responses/update';
 import { initVersionResponse, versionResponse } from './responses/version';
 
 /**
@@ -105,6 +106,14 @@ export async function startHTTPServer() {
 		});
 	});
 
+	// Update icon sets
+	server.get('/update', (req, res) => {
+		generateUpdateResponse(req.query, res);
+	});
+	server.post('/update', (req, res) => {
+		generateUpdateResponse(req.query, res);
+	});
+
 	// Options
 	server.options('/*', (req, res) => {
 		res.send(200);
diff --git a/src/http/responses/update.ts b/src/http/responses/update.ts
new file mode 100644
index 0000000..01fe083
--- /dev/null
+++ b/src/http/responses/update.ts
@@ -0,0 +1,64 @@
+import type { FastifyReply, FastifyRequest } from 'fastify';
+import { appConfig } from '../../config/app';
+import { triggerIconSetsUpdate } from '../../data/icon-sets';
+import { runWhenLoaded } from '../../data/loading';
+
+let pendingUpdate = false;
+let lastError = 0;
+
+const envKey = 'APP_UPDATE_SECRET';
+
+function logError(msg: string) {
+	const time = Date.now();
+
+	// Do not log error too often
+	if (time > lastError + 3600000) {
+		lastError = time;
+		console.error(msg);
+	}
+}
+
+function checkKey(query: Record<string, string>): boolean {
+	if (appConfig.updateRequiredParam) {
+		const expectedValue = process.env[envKey];
+		if (!expectedValue) {
+			// Missing env variable
+			logError(`Cannot process update request: missing env variable "${envKey}"`);
+			return false;
+		}
+
+		const value = query[appConfig.updateRequiredParam];
+		if (value !== expectedValue) {
+			return false;
+		}
+
+		// Success
+		return true;
+	}
+
+	// No param
+	logError(
+		'Auto-update can be triggered by anyone. Set `updateRequiredParam` config or UPDATE_REQUIRED_PARAM env variable to require secret to trigger update'
+	);
+	return true;
+}
+
+/**
+ * Generate icons data
+ */
+export function generateUpdateResponse(query: FastifyRequest['query'], res: FastifyReply) {
+	if (appConfig.allowUpdate && checkKey((query || {}) as Record<string, string>) && !pendingUpdate) {
+		pendingUpdate = true;
+		runWhenLoaded(() => {
+			const delay = appConfig.updateThrottle;
+			console.log('Will check for update in', delay, 'seconds...');
+			setTimeout(() => {
+				triggerIconSetsUpdate();
+				pendingUpdate = false;
+			}, delay * 1000);
+		});
+	}
+
+	// Fake 404
+	res.send(404);
+}
diff --git a/src/types/config/app.ts b/src/types/config/app.ts
index 8b639ff..8f8d303 100644
--- a/src/types/config/app.ts
+++ b/src/types/config/app.ts
@@ -23,4 +23,13 @@ export interface AppConfig {
 
 	// Logging
 	log: boolean;
+
+	// Allow update
+	allowUpdate: boolean;
+
+	// Update key
+	updateRequiredParam: string;
+
+	// Update check throttling
+	updateThrottle: number;
 }