diff --git a/CHANGELOG.md b/CHANGELOG.md
index 02bf5734d..7de55fe63 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - The daemon templates in the admin settings no longer prefill the HaRP shared key or HaProxy password. #1083
 - HaRP receives the verb of each ExApp route, so HaRP 0.4.8 and newer check the HTTP method of a request as the ExApp proxy does. #1138
 - The ExApp proxy accepts `HEAD` on routes that list `GET` and reads a route's verb as a list of methods, as HaRP does. #1144
+- The HaRP version check in the admin overview warns about HaRP older than 0.4.8, which checks the HTTP method of requests to ExApps. #1149
 
 ### Fixed
 
diff --git a/lib/AppInfo/Application.php b/lib/AppInfo/Application.php
index 4e8238ad1..fcdf7609d 100644
--- a/lib/AppInfo/Application.php
+++ b/lib/AppInfo/Application.php
@@ -46,7 +46,7 @@ class Application extends App implements IBootstrap {
 	public const APP_ID = 'app_api';
 	public const TEST_DEPLOY_APPID = 'test-deploy';
 	public const TEST_DEPLOY_INFO_XML = 'https://raw.githubusercontent.com/nextcloud/test-deploy/main/appinfo/info.xml';
-	public const MINIMUM_HARP_VERSION = '0.3.0';
+	public const MINIMUM_HARP_VERSION = '0.4.8';
 
 	public function __construct(array $urlParams = []) {
 		parent::__construct(self::APP_ID, $urlParams);
diff --git a/lib/SetupChecks/HarpVersionCheck.php b/lib/SetupChecks/HarpVersionCheck.php
index 424c3576a..9ff1dd551 100644
--- a/lib/SetupChecks/HarpVersionCheck.php
+++ b/lib/SetupChecks/HarpVersionCheck.php
@@ -91,12 +91,13 @@ private function fulfillsMinimumVersionRequirement(string $version): bool {
 	}
 
 	private function getHarpVersion(DaemonConfig $daemonConfig): ?string {
-		$cacheKey = $daemonConfig->getName() . '_' . (string)crc32(json_encode($daemonConfig));
+		// With the minimum in the key, a version cached against an older minimum is asked again.
+		$cacheKey = $daemonConfig->getName() . '_' . (string)crc32(json_encode($daemonConfig)) . '_' . Application::MINIMUM_HARP_VERSION;
 		$version = $this->cache?->get($cacheKey);
 		if ($version === null) {
 			$version = $this->harpService->getHarpVersion($daemonConfig);
-			$oneWeek = 60 * 60 * 24 * 7;
-			$this->cache?->set($cacheKey, $version, $oneWeek);
+			$ttl = $version !== null && $this->fulfillsMinimumVersionRequirement($version) ? 60 * 60 * 24 * 7 : 60 * 60;
+			$this->cache?->set($cacheKey, $version, $ttl);
 		}
 		return $version;
 	}
diff --git a/tests/php/SetupChecks/HarpVersionCheckTest.php b/tests/php/SetupChecks/HarpVersionCheckTest.php
new file mode 100644
index 000000000..b8f20a53f
--- /dev/null
+++ b/tests/php/SetupChecks/HarpVersionCheckTest.php
@@ -0,0 +1,63 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\AppAPI\Tests\php\SetupChecks;
+
+use OCA\AppAPI\AppInfo\Application;
+use OCA\AppAPI\Db\DaemonConfig;
+use OCA\AppAPI\Service\DaemonConfigService;
+use OCA\AppAPI\Service\HarpService;
+use OCA\AppAPI\SetupChecks\HarpVersionCheck;
+use OCP\ICache;
+use OCP\ICacheFactory;
+use OCP\IL10N;
+use OCP\SetupCheck\SetupResult;
+use PHPUnit\Framework\TestCase;
+use Psr\Log\LoggerInterface;
+
+class HarpVersionCheckTest extends TestCase {
+
+	private function runCheck(?string $harpVersion, int $expectedCacheTtl): SetupResult {
+		$l10n = $this->createMock(IL10N::class);
+		$l10n->method('t')->willReturnCallback(fn (string $text, array $parameters = []) => vsprintf($text, $parameters));
+		$daemonConfigService = $this->createMock(DaemonConfigService::class);
+		$daemonConfigService->method('getRegisteredDaemonConfigs')->willReturn([
+			new DaemonConfig(['name' => 'harp_proxy', 'deploy_config' => ['harp' => ['exapp_direct' => false]]]),
+		]);
+		$harpService = $this->createMock(HarpService::class);
+		$harpService->method('getHarpVersion')->willReturn($harpVersion);
+		$cache = $this->createMock(ICache::class);
+		$cache->method('get')->willReturn(null);
+		// The minimum is part of the key, so a version cached by an older AppAPI is not reused after an upgrade.
+		$cache->expects(self::once())->method('set')->with(self::stringEndsWith('_' . Application::MINIMUM_HARP_VERSION), $harpVersion, $expectedCacheTtl);
+		$cacheFactory = $this->createMock(ICacheFactory::class);
+		$cacheFactory->method('isAvailable')->willReturn(true);
+		$cacheFactory->method('createDistributed')->willReturn($cache);
+
+		$check = new HarpVersionCheck($l10n, $this->createMock(LoggerInterface::class), $daemonConfigService, $harpService, $cacheFactory);
+		return $check->run();
+	}
+
+	public function testHarpWithoutRouteVerbChecksIsTooOld(): void {
+		$result = $this->runCheck('0.4.7', 60 * 60);
+		self::assertSame(SetupResult::WARNING, $result->getSeverity());
+		self::assertStringContainsString('"0.4.7", which is too old. The minimum required version is "0.4.8"', $result->getDescription());
+	}
+
+	public function testUnreachableHarpIsReported(): void {
+		$result = $this->runCheck(null, 60 * 60);
+		self::assertSame(SetupResult::WARNING, $result->getSeverity());
+		self::assertStringContainsString('Could not retrieve HaRP version from daemon "harp_proxy"', $result->getDescription());
+	}
+
+	public function testCurrentHarpPasses(): void {
+		$result = $this->runCheck('0.4.8', 60 * 60 * 24 * 7);
+		self::assertSame(SetupResult::SUCCESS, $result->getSeverity());
+	}
+}