diff --git a/README.md b/README.md
index d1cfb30..cae5278 100644
--- a/README.md
+++ b/README.md
@@ -275,6 +275,13 @@ curl -X POST http://localhost:8000/api/auth/refresh \\
 
 Refresh-token reuse or a mismatched device ID returns `401` and revokes the token family. Signing out revokes the token family, while changing the password or completing a password reset revokes all sessions for the user.
 
+Sign out with the access token in the bearer header:
+
+```sh
+curl -X POST http://localhost:8000/api/auth/logout \\
+  -H 'Authorization: Bearer YOUR_ACCESS_TOKEN'
+```
+
 Submit a link using the returned access token:
 
 ```sh
diff --git a/Security-audit.md b/Security-audit.md
index e6997ad..7a99bc8 100644
--- a/Security-audit.md
+++ b/Security-audit.md
@@ -42,13 +42,15 @@ The application should remain behind the production reverse proxy, with real DNS
 
 ### SA-001: Logout uses non-standard token transport
 
-**Severity:** High  
-**Evidence:** `POST /api/auth/logout` accepts `{"token": ...}` in the JSON request body, and the web frontend sends the access token this way.  
+**Severity:** High, remediated in current worktree
+**Evidence before remediation:** `POST /api/auth/logout` accepted `{"token": ...}` in the JSON request body, and the web frontend sent the access token this way.
 **Impact:** Request bodies may be captured by debugging middleware, application logs, or monitoring systems. The endpoint also diverges from the bearer-header contract used elsewhere, increasing the chance of inconsistent token handling.
 
-**Recommendation:** Make logout use `Authorization: Bearer <access-token>` and revoke the authenticated token or its family server-side. If a compatibility period is required, support both forms temporarily, prefer the header, and remove the body form after client migration. Add tests proving body-only tokens are rejected once compatibility is removed.
+**Current state:** Logout requires `Authorization: Bearer <access-token>`, rejects body-only tokens with `401`, and revokes the token family server-side. The web frontend and Firefox extension send the header; regression coverage verifies access and refresh tokens are invalid after logout.
 
-**Priority:** High.
+**Recommendation:** Keep logout header-only, retain family revocation, avoid logging authorization headers, and rotate legacy sessions issued before this change.
+
+**Priority:** Completed in code; legacy session rotation and log hygiene remain.
 
 ### SA-002: Raw infrastructure errors are returned to clients
 
diff --git a/VIBE/CHAT_LOG.md b/VIBE/CHAT_LOG.md
index 7256f5a..17de7ae 100644
--- a/VIBE/CHAT_LOG.md
+++ b/VIBE/CHAT_LOG.md
@@ -1,5 +1,11 @@
 # Chat Log
 
+### User
+Remedy SA-001: Logout uses non-standard token transport.
+
+### Assistant outcome
+Migrated logout to require `Authorization: Bearer <access-token>`, updated the web frontend and Firefox extension, and added regression coverage proving body-only logout is rejected while header logout revokes the access token and refresh-token family. Updated SA-001, the checklist, and README examples.
+
 ### User
 Perform a new security audit overwriting Security-audit.md with new and remaining issues.
 
diff --git a/VIBE/PROMPTS.md b/VIBE/PROMPTS.md
index 2c6ca63..1f4c18b 100644
--- a/VIBE/PROMPTS.md
+++ b/VIBE/PROMPTS.md
@@ -200,6 +200,7 @@
 194. Replace LINKLOG_TOKEN_EXPIRY_DAYS with LINKLOG_TOKEN_EXPIRY_MINUTES, add LINKLOG_REFRESH_TOKEN_EXPIRY_DAYS to production Compose, and add a CI configuration consistency test.
 195. Perform a new security audit overwriting Security-audit.md with new and remaining issues.
 195. Update SA-012 and README for the implemented refresh-token lifecycle, revocation behavior, and refresh endpoint.
+196. Remedy SA-001: migrate logout from JSON token transport to the Authorization bearer header.
 
 ## Future entries
 
diff --git a/XPI/unsigned/LinkLog-0.1.0.xpi b/XPI/unsigned/LinkLog-0.1.0.xpi
index 6657fbf..a6196d2 100644
Binary files a/XPI/unsigned/LinkLog-0.1.0.xpi and b/XPI/unsigned/LinkLog-0.1.0.xpi differ
diff --git a/backend/app/api/auth.py b/backend/app/api/auth.py
index 7c88a88..d570bb7 100644
--- a/backend/app/api/auth.py
+++ b/backend/app/api/auth.py
@@ -3,7 +3,7 @@
 
 from uuid import uuid4
 
-from fastapi import APIRouter, Depends, HTTPException, Request
+from fastapi import APIRouter, Depends, Header, HTTPException, Request
 from pydantic import BaseModel
 
 from backend.app.api.dependencies import get_current_user
@@ -119,10 +119,12 @@ def reset_password_endpoint(payload: PasswordResetRequest):
 
 
 @router.post('/logout')
-def logout(payload: dict):
-    token = payload.get('token')
+def logout(authorization: str | None = Header(default=None)):
+    if not authorization or not authorization.startswith('Bearer '):
+        raise HTTPException(status_code=401, detail='Missing or invalid Authorization header')
+    token = authorization.replace('Bearer ', '', 1).strip()
     if not token:
-        raise HTTPException(status_code=400, detail='Token is required')
+        raise HTTPException(status_code=401, detail='Missing or invalid Authorization header')
     revoked = revoke_token(token)
     if not revoked:
         raise HTTPException(status_code=404, detail='Token not found or already revoked')
diff --git a/backend/tests/test_api.py b/backend/tests/test_api.py
index a3b72ac..c9dab5d 100644
--- a/backend/tests/test_api.py
+++ b/backend/tests/test_api.py
@@ -55,6 +55,17 @@ def test_login_returns_token():
     assert client.get('/api/auth/me', params={'token': payload['access_token']}).status_code == 401
 
 
+def test_logout_requires_bearer_header_and_revokes_token_family():
+    login = client.post('/api/auth/login', json={'email': 'alice@example.com', 'password': 'secret123'}).json()
+    token = login['access_token']
+    headers = {'Authorization': f'Bearer {token}'}
+    assert client.post('/api/auth/logout', json={'token': token}).status_code == 401
+    assert client.get('/api/auth/me', headers=headers).status_code == 200
+    assert client.post('/api/auth/logout', headers=headers).status_code == 200
+    assert client.get('/api/auth/me', headers=headers).status_code == 401
+    assert client.post('/api/auth/refresh', json={'refresh_token': login['refresh_token'], 'device_id': login['device_id']}).status_code == 401
+
+
 def test_login_rate_limit_locks_out_after_five_failures_and_resets_on_success():
     email = f'unknown-{uuid4().hex}@example.com'
     for attempt in range(5):
@@ -643,8 +654,7 @@ def test_only_link_owner_can_edit_link():
 
 def test_logout_revokes_token_and_admin_can_list_plugins():
     headers = login_headers()
-    token = headers['Authorization'].removeprefix('Bearer ')
-    assert client.post('/api/auth/logout', json={'token': token}).status_code == 200
+    assert client.post('/api/auth/logout', headers=headers).status_code == 200
 
     revoked_response = client.post('/api/links', headers=headers, json={
         'title': 'Should fail',
diff --git a/frontend/static/logout.js b/frontend/static/logout.js
index f1e6063..ac971f3 100644
--- a/frontend/static/logout.js
+++ b/frontend/static/logout.js
@@ -12,8 +12,7 @@ logoutButton.addEventListener('click', async () => {
   if (token) {
     await fetch('/api/auth/logout', {
       method: 'POST',
-      headers: {'Content-Type': 'application/json'},
-      body: JSON.stringify({token}),
+      headers: {Authorization: `Bearer ${token}`},
     }).catch(() => undefined);
   }
 
diff --git a/webextension/options.js b/webextension/options.js
index e5d927e..a5631bb 100644
--- a/webextension/options.js
+++ b/webextension/options.js
@@ -186,8 +186,7 @@ async function signOut() {
   if (sessionSettings.accessToken && settings.backendUrl && await hasBackendPermission(backendUrl)) {
     await fetch(`${backendUrl}/api/auth/logout`, {
       method: 'POST',
-      headers: { 'Content-Type': 'application/json' },
-      body: JSON.stringify({ token: sessionSettings.accessToken }),
+      headers: {Authorization: `Bearer ${sessionSettings.accessToken}`},
     }).catch(() => undefined);
   }
   await clearSession();