diff --git a/packages/core/src/browser/cdp.ts b/packages/core/src/browser/cdp.ts
index b3185cd6c..c955eadd6 100644
--- a/packages/core/src/browser/cdp.ts
+++ b/packages/core/src/browser/cdp.ts
@@ -10,7 +10,6 @@
  */
 
 import { fstatSync } from 'node:fs';
-import { SOCKET_OPTIONS } from '../client.ts';
 
 type Listener = (params: Record<string, unknown>, sessionId: string | undefined) => void;
 interface Waiting { resolve(value: Record<string, unknown>): void; reject(error: Error): void; timer: ReturnType<typeof setTimeout>; method: string }
@@ -95,7 +94,7 @@ export class Cdp {
   /** The Windows transport: the browser's WebSocket endpoint on 127.0.0.1. */
   static connect(url: string, timeoutMs = 10_000): Promise<Cdp> {
     return new Promise((resolve, reject) => {
-      const socket = new WebSocket(url, SOCKET_OPTIONS as unknown as string[]);
+      const socket = new WebSocket(url);
       const timer = setTimeout(() => { socket.close(); reject(new CdpError(`the browser did not accept a DevTools connection within ${timeoutMs / 1000} seconds`)); }, timeoutMs);
       socket.addEventListener('error', () => { clearTimeout(timer); reject(new CdpError(`could not connect to the browser's DevTools at ${url}`)); }, { once: true });
       socket.addEventListener('open', () => {
diff --git a/packages/core/src/client.ts b/packages/core/src/client.ts
index 286c05930..8b2567b58 100644
--- a/packages/core/src/client.ts
+++ b/packages/core/src/client.ts
@@ -81,21 +81,12 @@ export class SocketClosedError extends Error {
   }
 }
 
-/**
- * What every WebSocket this code opens with Bun's client passes: no
- * `permessage-deflate` offer. With the extension on, Bun 1.4.2 and 1.4.3
- * sometimes close a sound stream with 1002 ("control frame is fragmented",
- * "unsupported control frame", "unexpected opcode"): against the core's own
- * server and against Chrome's DevTools, whose bytes a relay checked frame by
- * frame and found well-formed. Uncompressed, a message is larger on the wire;
- * compressed, the connection drops.
- */
-export const SOCKET_OPTIONS = { perMessageDeflate: false } as const;
-
 export async function connect(url: string, token: string, options: ConnectOptions = {}): Promise<CoreClient> {
   const timeoutMs = options.timeoutMs ?? 5000;
   const deadline = Date.now() + timeoutMs;
-  const socket = new WebSocket(socketUrl(url), { ...SOCKET_OPTIONS, ...(options.headers === undefined ? {} : { headers: options.headers }) } as unknown as string[]);
+  const socket = options.headers === undefined
+    ? new WebSocket(socketUrl(url))
+    : new WebSocket(socketUrl(url), { headers: options.headers } as unknown as string[]);
   const pending = new Map<number, Pending>();
   const listeners = new Map<string, Set<(payload: unknown) => void>>();
   let nextId = 1;
diff --git a/packages/core/src/group/relay.ts b/packages/core/src/group/relay.ts
index 203fc27c2..afd1b2c9f 100644
--- a/packages/core/src/group/relay.ts
+++ b/packages/core/src/group/relay.ts
@@ -29,7 +29,6 @@
 
 import type { ServerWebSocket } from 'bun';
 import { FILE_ROUTE, GROUP_RELAY_ROUTE, PROTOCOL_VERSION, RPC_PATH, RpcErrorCode, VIEW_ROUTE } from '@boite/contracts';
-import { SOCKET_OPTIONS } from '../client.ts';
 import type { Core } from '../core.ts';
 import { messageOf } from '../errors.ts';
 import { OUTBOUND_CONGESTION_TIMEOUT_MS, OUTBOUND_MAX_BUFFERED_BYTES } from '../server/connection.ts';
@@ -389,7 +388,7 @@ export class RelayPipe {
       const opened = await new Promise<Upstream | null>((resolve) => {
         let socket: Upstream;
         try {
-          socket = new WebSocket(`${target.replace(/^http/, 'ws')}${RPC_PATH}`, SOCKET_OPTIONS as unknown as string[]);
+          socket = new WebSocket(`${target.replace(/^http/, 'ws')}${RPC_PATH}`);
         } catch {
           resolve(null);
           return;
diff --git a/packages/core/test/browser/fixture.ts b/packages/core/test/browser/fixture.ts
index 8bd8a837c..03d59b68b 100644
--- a/packages/core/test/browser/fixture.ts
+++ b/packages/core/test/browser/fixture.ts
@@ -3,7 +3,7 @@ import { mkdirSync, mkdtempSync, rmSync } from 'node:fs';
 import { tmpdir } from 'node:os';
 import { join } from 'node:path';
 import type { RemoteBrowserFrame, RemoteBrowserUnchanged } from '@boite/contracts';
-import { connect, SOCKET_OPTIONS, type CoreClient } from '../../src/client.ts';
+import { connect, type CoreClient } from '../../src/client.ts';
 import { chromiumArgs, findChromium, waitForEndpoint } from '../../src/browser/chromium.ts';
 import { echoThread, startTestCore, type TestCore } from '../harness.ts';
 
@@ -148,7 +148,7 @@ export function createBrowserFixture() {
     try {
       const args = chromiumArgs(dir, 'linux').filter(arg => arg !== '--remote-debugging-pipe');
       browser = Bun.spawn([findChromium().path!, ...args, '--remote-debugging-port=0', '--remote-debugging-address=127.0.0.1', ...extraArgs], { stdout: 'ignore', stderr: 'ignore' });
-      const connectedSocket = socket = new WebSocket(await waitForEndpoint(dir, browser.exited), SOCKET_OPTIONS as unknown as string[]);
+      const connectedSocket = socket = new WebSocket(await waitForEndpoint(dir, browser.exited));
       await new Promise<void>((resolve, reject) => {
         const finish = (error?: Error) => {
           clearTimeout(timer);
diff --git a/packages/core/test/socket-options.test.ts b/packages/core/test/socket-options.test.ts
deleted file mode 100644
index 10fa3fa75..000000000
--- a/packages/core/test/socket-options.test.ts
+++ /dev/null
@@ -1,28 +0,0 @@
-import { expect, test } from 'bun:test';
-import { Cdp } from '../src/browser/cdp.ts';
-import { connect } from '../src/client.ts';
-
-// Bun's client with permessage-deflate on sometimes closes a sound stream with
-// 1002 (see SOCKET_OPTIONS): no socket this code opens may offer it.
-test('the core client and the DevTools socket never offer permessage-deflate', async () => {
-  const offers: Array<string | null> = [];
-  const server = Bun.serve({
-    hostname: '127.0.0.1', port: 0,
-    fetch(request, self) {
-      offers.push(request.headers.get('sec-websocket-extensions'));
-      return self.upgrade(request) ? undefined : new Response('upgrade required');
-    },
-    websocket: { perMessageDeflate: true, message() {} },
-  });
-  try {
-    const url = `http://127.0.0.1:${server.port}`;
-    for (const headers of [undefined, { origin: url }]) {
-      await expect(connect(url, 'token', { timeoutMs: 200, headers })).rejects.toThrow();
-    }
-    const cdp = await Cdp.connect(`ws://127.0.0.1:${server.port}/devtools/browser/test`);
-    cdp.close();
-    expect(offers).toEqual([null, null, null]);
-  } finally {
-    server.stop(true);
-  }
-});
diff --git a/tests/e2e/group-devices.test.ts b/tests/e2e/group-devices.test.ts
index 2c28d5968..e978aca31 100644
--- a/tests/e2e/group-devices.test.ts
+++ b/tests/e2e/group-devices.test.ts
@@ -8,7 +8,7 @@ import { startUi } from './lib/ui.ts';
 import { startCore, type RunningCore } from './lib/core.ts';
 import { mobileAction } from './lib/mobile.ts';
 import { codeVideo } from './lib/qr-video.ts';
-import { connect, SOCKET_OPTIONS, type CoreClient } from '../../packages/core/src/client.ts';
+import { connect, type CoreClient } from '../../packages/core/src/client.ts';
 
 /**
  * A phone is a device of the group, not of one machine.
@@ -71,7 +71,7 @@ function proxy(core: RunningCore): ReturnType<typeof Bun.serve> {
     websocket: {
       open(socket: ServerWebSocket<Piped>) {
         const headers: Record<string, string> = { host: socket.data.host, ...(socket.data.origin === null ? {} : { origin: socket.data.origin }) };
-        const upstream = new WebSocket(`${core.url.replace(/^http/, 'ws')}${socket.data.path}`, { ...SOCKET_OPTIONS, headers } as unknown as string[]);
+        const upstream = new WebSocket(`${core.url.replace(/^http/, 'ws')}${socket.data.path}`, { headers } as unknown as string[]);
         upstream.binaryType = 'arraybuffer';
         socket.data.upstream = upstream;
         upstream.onopen = () => {
diff --git a/tests/e2e/lib/cdp.ts b/tests/e2e/lib/cdp.ts
index 3bb2883c8..f03659017 100644
--- a/tests/e2e/lib/cdp.ts
+++ b/tests/e2e/lib/cdp.ts
@@ -4,7 +4,6 @@ import { tmpdir } from 'node:os';
 import { dirname, join } from 'node:path';
 import { ONBOARDING_STORAGE_KEY, ONBOARDING_VERSION } from '../../../packages/ui/src/lib/onboarding.ts';
 import type { Subprocess } from 'bun';
-import { SOCKET_OPTIONS } from '../../../packages/core/src/client.ts';
 import { E2E_DIR_PREFIX, killProcessTreeAsync, removeDirectory, watchParentDeath, type ParentDeathWatch } from './cleanup.ts';
 
 /**
@@ -711,7 +710,7 @@ function openSocket(target: TargetInfo): Promise<WebSocket> {
   const url = target.webSocketDebuggerUrl;
   if (url === undefined) throw new Error('the page target has no debugger url');
   return new Promise<WebSocket>((resolve, reject) => {
-    const socket = new WebSocket(url, SOCKET_OPTIONS as unknown as string[]);
+    const socket = new WebSocket(url);
     // A socket that never opened is closed with its refusal: nothing else
     // holds it, and a late open would keep its connection for the whole run.
     const fail = (message: string) => {