diff --git a/backend/src/routes/auth.routes.ts b/backend/src/routes/auth.routes.ts
index 216e202..dcd18f2 100644
--- a/backend/src/routes/auth.routes.ts
+++ b/backend/src/routes/auth.routes.ts
@@ -152,7 +152,7 @@ router.post("/refresh", async (req: Request, res: Response): Promise<void> => {
   }
 
   try {
-    const response = await fetch(`${superOAuthUrl}/api/v1/auth/token/refresh`, {
+    const response = await fetch(`${superOAuthUrl}/api/v1/auth/refresh`, {
       method: "POST",
       headers: { "Content-Type": "application/json" },
       body: JSON.stringify({ refreshToken }),
@@ -160,22 +160,22 @@ router.post("/refresh", async (req: Request, res: Response): Promise<void> => {
 
     const data = await response.json() as {
       success: boolean;
-      data?: { tokens: { accessToken: string; refreshToken?: string }; user?: { id: string; email: string | null; nickname: string } };
+      data?: { accessToken: string; refreshToken?: string };
       error?: string;
     };
 
-    if (!response.ok || !data.data?.tokens?.accessToken) {
+    if (!response.ok || !data.data?.accessToken) {
       res.clearCookie(COOKIE_NAME);
       res.clearCookie(REFRESH_COOKIE_NAME);
       res.status(401).json({ success: false, error: "REFRESH_FAILED" });
       return;
     }
 
-    res.cookie(COOKIE_NAME, data.data.tokens.accessToken, COOKIE_OPTIONS);
-    if (data.data.tokens.refreshToken) {
-      res.cookie(REFRESH_COOKIE_NAME, data.data.tokens.refreshToken, REFRESH_COOKIE_OPTIONS);
+    res.cookie(COOKIE_NAME, data.data.accessToken, COOKIE_OPTIONS);
+    if (data.data.refreshToken) {
+      res.cookie(REFRESH_COOKIE_NAME, data.data.refreshToken, REFRESH_COOKIE_OPTIONS);
     }
-    res.json({ success: true, data: { user: data.data.user ?? null } });
+    res.json({ success: true });
   } catch (err) {
     logger.error("POST /auth/refresh — auth service unavailable", { err });
     res.status(500).json({ success: false, error: "AUTH_SERVICE_UNAVAILABLE" });
diff --git a/frontend/src/context/AuthContext.tsx b/frontend/src/context/AuthContext.tsx
index 9efa02a..475e37b 100644
--- a/frontend/src/context/AuthContext.tsx
+++ b/frontend/src/context/AuthContext.tsx
@@ -38,6 +38,13 @@ export function AuthProvider({ children }: { children: ReactNode }) {
     return () => { cancelled = true; };
   }, []);
 
+  // Token expiré et refresh impossible → déconnexion silencieuse
+  useEffect(() => {
+    const handler = () => setUser(null);
+    window.addEventListener('auth:expired', handler);
+    return () => window.removeEventListener('auth:expired', handler);
+  }, []);
+
   return (
     <AuthContext.Provider value={{ user, loading, setUser }}>
       {children}
diff --git a/frontend/src/lib/api.ts b/frontend/src/lib/api.ts
index 639a438..a99b9b3 100644
--- a/frontend/src/lib/api.ts
+++ b/frontend/src/lib/api.ts
@@ -8,19 +8,39 @@ export class ApiError extends Error {
   }
 }
 
-export async function apiFetch<T>(path: string, init?: RequestInit): Promise<T> {
-  const res = await fetch(`${BASE}${path}`, {
-    credentials: 'include', // transmet le cookie httpOnly automatiquement
+function buildInit(init?: RequestInit): RequestInit {
+  return {
+    credentials: 'include',
     ...init,
-    headers: {
-      'Content-Type': 'application/json',
-      ...init?.headers,
-    },
-  });
+    headers: { 'Content-Type': 'application/json', ...init?.headers },
+  };
+}
 
-  if (!res.ok) {
-    throw new ApiError(res.status, path);
+// Déduplique les appels refresh simultanés
+let refreshingPromise: Promise<boolean> | null = null;
+
+async function tryRefresh(): Promise<boolean> {
+  if (refreshingPromise) return refreshingPromise;
+  refreshingPromise = fetch(`${BASE}/auth/refresh`, { method: 'POST', credentials: 'include' })
+    .then((r) => r.ok)
+    .finally(() => { refreshingPromise = null; });
+  return refreshingPromise;
+}
+
+export async function apiFetch<T>(path: string, init?: RequestInit): Promise<T> {
+  const res = await fetch(`${BASE}${path}`, buildInit(init));
+
+  if (res.status === 401 && path !== '/auth/refresh') {
+    const refreshed = await tryRefresh();
+    if (refreshed) {
+      const retry = await fetch(`${BASE}${path}`, buildInit(init));
+      if (!retry.ok) throw new ApiError(retry.status, path);
+      return retry.json() as Promise<T>;
+    }
+    window.dispatchEvent(new Event('auth:expired'));
+    throw new ApiError(401, path);
   }
 
+  if (!res.ok) throw new ApiError(res.status, path);
   return res.json() as Promise<T>;
 }