diff --git a/.github/workflows/test-frontend.yml b/.github/workflows/test-frontend.yml
index 142967903f89..46a35ed8483e 100644
--- a/.github/workflows/test-frontend.yml
+++ b/.github/workflows/test-frontend.yml
@@ -101,7 +101,7 @@ jobs:
     - name: Cypress install
       run: pnpm exec cypress install
     - name: Cypress run
-      uses: cypress-io/github-action@v5
+      uses: cypress-io/github-action@v6
       with:
         install: false
         start: pnpm start:test
diff --git a/packages/frontend/src/components/MkUrlPreview.vue b/packages/frontend/src/components/MkUrlPreview.vue
index 1f9c336eee40..bac7f1e3100b 100644
--- a/packages/frontend/src/components/MkUrlPreview.vue
+++ b/packages/frontend/src/components/MkUrlPreview.vue
@@ -133,7 +133,7 @@ let unknownUrl = $ref(false);
 const requestUrl = new URL(props.url);
 if (!['http:', 'https:'].includes(requestUrl.protocol)) throw new Error('invalid url');
 
-if (requestUrl.hostname === 'twitter.com' || requestUrl.hostname === 'mobile.twitter.com') {
+if (requestUrl.hostname === 'twitter.com' || requestUrl.hostname === 'mobile.twitter.com' || requestUrl.hostname === 'x.com' || requestUrl.hostname === 'mobile.x.com') {
 	const m = requestUrl.pathname.match(/^\/.+\/status(?:es)?\/(\d+)/);
 	if (m) tweetId = m[1];
 }
diff --git a/packages/frontend/test/url-preview.test.ts b/packages/frontend/test/url-preview.test.ts
index b5fcf9beceb3..0cf3a417e2b9 100644
--- a/packages/frontend/test/url-preview.test.ts
+++ b/packages/frontend/test/url-preview.test.ts
@@ -152,4 +152,13 @@ describe('MkUrlPreview', () => {
 		assert.strictEqual(iframe?.getAttribute('allow'), 'fullscreen;web-share');
 		assert.strictEqual(iframe?.getAttribute('sandbox'), 'allow-popups allow-scripts allow-same-origin');
 	});
+
+	test('Loading a post in iframe', async () => {
+		const iframe = await renderAndOpenPreview({
+			url: 'https://x.com/i/web/status/1685072521782325249',
+		});
+		assert.exists(iframe, 'iframe should exist');
+		assert.strictEqual(iframe?.getAttribute('allow'), 'fullscreen;web-share');
+		assert.strictEqual(iframe?.getAttribute('sandbox'), 'allow-popups allow-scripts allow-same-origin');
+	});
 });
diff --git a/packages/misskey-js/etc/misskey-js.api.md b/packages/misskey-js/etc/misskey-js.api.md
index 9c598a090ec0..aa9c2157b656 100644
--- a/packages/misskey-js/etc/misskey-js.api.md
+++ b/packages/misskey-js/etc/misskey-js.api.md
@@ -2172,6 +2172,10 @@ export type Endpoints = {
         req: TODO;
         res: TODO;
     };
+    'users/flashs': {
+        req: TODO;
+        res: TODO;
+    };
     'users/recommendation': {
         req: TODO;
         res: TODO;
@@ -2822,7 +2826,7 @@ type UserSorting = '+follower' | '-follower' | '+createdAt' | '-createdAt' | '+u
 //
 // src/api.types.ts:16:32 - (ae-forgotten-export) The symbol "TODO" needs to be exported by the entry point index.d.ts
 // src/api.types.ts:18:25 - (ae-forgotten-export) The symbol "NoParams" needs to be exported by the entry point index.d.ts
-// src/api.types.ts:629:18 - (ae-forgotten-export) The symbol "ShowUserReq" needs to be exported by the entry point index.d.ts
+// src/api.types.ts:630:18 - (ae-forgotten-export) The symbol "ShowUserReq" needs to be exported by the entry point index.d.ts
 // src/streaming.types.ts:33:4 - (ae-forgotten-export) The symbol "FIXME" needs to be exported by the entry point index.d.ts
 
 // (No @packageDocumentation comment for this package)