diff --git a/src/services/token.ts b/src/services/token.ts
index 223ee52..10e7ee5 100644
--- a/src/services/token.ts
+++ b/src/services/token.ts
@@ -60,28 +60,34 @@ export default class TokenService {
       console.error('Erreur de validation du token:', error);
       return false;
     }
-
-    return true;
   }
 
-  removeToken(token: string): void {
-    this.tokens.delete(token);
-    this.saveTokensToStorage();
-  }
-
-  cleanExpiredTokens(): void {
-    const now = Date.now();
-    let hasExpired = false;
-    
-    for (const [token, data] of this.tokens.entries()) {
-      if (data.expiration < now) {
-        this.tokens.delete(token);
-        hasExpired = true;
+  async refreshAccessToken(refreshToken: string, origin: string): Promise<string | null> {
+    try {
+      // Vérifier si le refresh token est valide
+      const isValid = await this.validateToken(refreshToken, origin);
+      if (!isValid) {
+        return null;
       }
-    }
-    
-    if (hasExpired) {
-      this.saveTokensToStorage();
+
+      // Vérifier le type du token
+      const secret = new Uint8Array(this.encoder.encode(this.SECRET_KEY));
+      const { payload } = await jose.jwtVerify(refreshToken, secret);
+      if (payload.type !== 'refresh') {
+        return null;
+      }
+
+      // Générer un nouveau access token
+      const newAccessToken = await new jose.SignJWT({ origin, type: 'access' })
+        .setProtectedHeader({ alg: 'HS256' })
+        .setIssuedAt()
+        .setExpirationTime(this.ACCESS_TOKEN_EXPIRATION)
+        .sign(secret);
+
+      return newAccessToken;
+    } catch (error) {
+      console.error('Erreur lors du refresh du token:', error);
+      return null;
     }
   }
 }
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